(dissenting in part). This case represents another chapter in my continuing dialogue with my colleagues over the fundamental “burden of proof” issue in *268involuntary civil commitments. I am constrained to voice my grave concern here, as in State v. Carter, 64 N. J. 382, 410 (1974) (concurring and dissenting opinion), that in moving a step forward by recognizing rights of mental patients we not take two steps backward by neglecting the evidentiary rules necessary to safeguard those rights. The Court today runs the risk of doing precisely that by applying an inappropriate burden of proof and by overruling sub silentio those New Jersey cases which have called for a reasonable doubt standard in involuntary commitments.

While I concur in the Court’s resolution of the essential constitutional issues with which it has now come to grips, I disagree with the emphasized part of the following from the majority opinion:

If, following a hearing, the court finds that the State has shown by a preponderance of the evidence that defendant is mentally ill and is likely to pose * * *■ a danger [to himself or to society], it should order suitable restraints placed upon defendant’s liberty so as to protect the public and provide defendant with appropriate treatment (emphasis added; footnote omitted). [ante at 257.]

This “preponderance of the evidence” language must be read into our revised B. 4:74-7 governing civil commitment, which was under consideration at the same time as our deliberations on the instant case. It has now been adopted to take effect September 8, 1975. The Rule reads in pertinent part as follows:

(f) Final Judgment of Commitment, Review. If the court finds from the evidence presented at the [commitment] hearing that the institutionalization of the patient is required by reason of his being a danger to himself or the community if he is not so confined and treated, it shall enter a judgment of commitment to an appropriate institution. * * *

The Rule being silent on burden of proof,1 establishment of *269the appropriate burden is left to case law. One effect of today’s decision is to apply the bare preponderance burden not only to cases such as the one sub judice, where defendant was relieved of criminal responsibility for a violent act by reason of his insanity, but also to all other involuntary commitments. I would require proof of dangerousness beyond a reasonable doubt (which as I hope to demonstrate later in this opinion has always been the burden of proof requirement for involuntary civil commitment), preferably in terms referred to in footnote 1, supra. But I am reluctant to use this case in its present posture as the vehicle for deciding that critical issue.

*270While I appreciate the necessity of formulating a constitutional and workable procedure for disposition of persons acquitted by reason of insanity in light of our declaration of the unconstitutionality of N. J. S. A. 2A:163-3, I would have preferred to be favored with the views of the parties on .at least the “burden of proof of dangerousness” phase of that procedure. That issue was never briefed or argued — understandably, because all defendant sought by way of relief in this Court was a remand for the purpose of determining if his “condition had improved to the extent that he should be conditionally released.” The parties never reached nor apparently even contemplated the burden of proof issue. No reason has been offered why we should not follow our frequent practice of calling for at least briefs and perhaps additional oral argument on the question. To exercise that minimal caution seems the better practice when we either undertake to change the established law or start treading on unfamiliar soil, both of which we are doing here. The practical consequences of our own recent administrative directives, revised Rules, and holdings in the area of mental health law are but dimly perceived. As might be expected, the people most intimately involved as participants in the legal process have at this early stage some sharply divergent perceptions of that process itself and of their roles therein. Compare Stanton, “Involuntary Civil Commitment Proceedings: Á Trial Judge’s View,” 98 N. J. L. J. 425 (1975), with Singer, “Civil Commitment Proceedings: A Response to ‘A Trial Judge’s View,’ ” 98 N. J. L. J. 553 (1975). We should invite the parties to share with us their views. However, under the circumstances I must announce my position without the benefit of counsel’s research and efforts at persuasion.

I start with the notion, now firmly established, that for all the reasons which Justice Pashman has so aptly set forth in the majority opinion, and to which he adverted in his opinion for the Court in State v. Carter, supra, 64 N. J. at *271401, our law treats one in the position of this defendant precisely the same way as any other patient facing involuntary commitment to a mental institution. No one, I daresay, would deny due process to people in that circumstance. What “process” is “due” in a particular factual context turns in large part upon what interests are involved. At stake in any involuntary commitment are the security of the community on the one hand and, on the other, the patient’s liberty, “an interest of transcending value.” Speiser v. Randall 357 U. S. 513, 525, 78 S. Ct. 1332, 1341, 2 L. Ed. 2d 1460, 1472 (1958). When personal liberty may be lost and the defendant faces the possible stigma of a criminal conviction,2 the Supreme Court has declared as a constitutional imperative that proof of all elements of the case against him be beyond a reasonable doubt. In re Winship, 397 U. S. 358, 363-64, 90 S. Ct. 1068, 1072-73, 25 L. Ed. 2d 368, 375 (1970).

Mr. Justice Harlan’s concurring opinion in Winship exposes by meticulous analysis the basic policy considerations which lead to selection of what standard of proof should be applied in a given situation.3 He emphasizes that our *272system of laws does “not view the social disutility of convicting an innocent man as equivalent to the disutility of acquitting someone who is guilty,” and that when personal liberty is in jeopardy, the margin of error in fact-finding should be reduced by increasing the burden of proof. In re Winship, supra, 397 U. S. at 372, 90 S. Ct. at 1076, 25 L. Ed. 2d at 380. See In re Ballay, 157 U. S. App. D. C. 59, 482 F. 2d 648, 662-67 (D. C. Cir. 1973).

*273Can we carry this analysis over to the involuntary commitment context F I believe we can. The fact that the proceeding for commitment is "civil" in nature rather than "criminal” presents no obstacle. In re Gault, 387 U. S. 1, 87 S. Ct. 1428, 18 L. Ed. 2d 527 (1967), and In re Winship, supra, both involving juvenile proceedings civil in nature, have put to rest any suggestion that the measure of due process which must be afforded a defendant is to he determined by the label under which the proceeding parades. *274See Murel v. Baltimore City Crim. Ct., 407 U. S. 355, 364, 92 S. Ct. 2091, 2095, 32 L. Ed. 2d 791, 796-97 (1972) (Douglas, J., dissenting). Gault stresses the restraint of liberty to which the party is exposed. Mr. Justice Portas said:

A boy is charged with misconduct. The boy is committed to an' institution where he may be restrained of liberty for years. It is of no constitutional consequence — and of limited practical meaning — that the institution to which he is committed is called an Industrial School. The fact of the matter is that, however euphemistic the title, a “receiving home” or an “industrial school” for juveniles is an institution of confinement in which the child is incarcerated for a greater or lesser time. His world becomes “a building with whitewashed walls, regimented routine and institutional hours * * Instead of mother and father and sisters and brothers and friends and classmates, his world is peopled by guards, custodians, state employees, and “delinquents” confined with him for anything from waywardness to rape and homicide (footnotes omitted). [387 U. S. at 27, 87 S. Ct. at 1443, 18 L. Ed. 2d at 546.]

Not much different, I submit, from what may be found in some parts of our mental institutions. And the period for which a mental patient’s liberty may be restrained is not fixed in any sense but rather is termed “permanent,” B. 4: 74-7 (e), subject to periodic review, B. 4:74-7(f), or, as more accurately (if no less disquietingly) labelled by the majority, “indefinite,” ante at 257.

Much more important to me is that element on which Judge Tamm focuses in In re Ballay, supra, 482 F. 2d at 664-67, “the very nature of the evidence presented.” He discusses the difficulties implicit in proving “dangerousness,” emphasized in both of the opinions in Carter and the majority opinion herein. The point as I see it is that the impulse of the psychiatrist is to err on the side of finding “dangerousness” more often than not, see State v. Carter, supra, 64 N. J. at 426-27 n. 7 (concurring and dissenting opinion) ; that the psychiatric community is in frequent disagreement on diagnostic conclusions, see Diamond, “The Psychiatric Prediction of Dangerousness,” 123 U. Pa. L. *275Rev. 439 (1974); Ennis and Litwaek, “Psychiatry and the Presumption of Expertise: Flipping Coins in the Courtroom,” 62 Calif. L. Rev. 693 (1974); Rosenhan, “On Being Sane in Insane Places,” 13 Santa Clara Law. 379 (1973); and that in making a determination of dangerousness (largely undefined and even less susceptible of proof than mental illness) the finder of fact “may unduly reflect clinical definitions and conclusions rather than the appropriate judicial exegeties and community values.” In re Ballay, supra, 482 F. 2d at 665. The difficulty in making the critical determination, that defendant is mentally ill and poses a danger to himself or society if not restrained, militates in favor of the higher burden of proof beyond a reasonable doubt to reduce the substantial opportunity for error, particularly when, as here, the consequence of that error is loss of liberty. See, in addition to the cases recognized by the majority in footnote 9, ante at 357, as representative of the recent trend to require a burden of proof greater than bare preponderance of the evidence, Davis v. Watkins, 384 F. Supp. 1196 (N. D. Ohio 1974); Lynch v. Baxley, 386 F. Supp. 378 (M. D. Ala. 1974); Denton v. Commonwealth, 383 S. W. 2d 681 (Ky. App. 1964). See also People v. Burnick, 14 Cal. 3d 306, 121 Cal. Rptr. 488, 535 P. 2d 352 (1975) (requiring proof of dangerousness heyond a reasonable doubt for commitment under a “civil” mentally disordered sex offender statute).

In line with these decisions are several New Jersey eases holding that reasonable doubt is the appropriate standard for confinement: In re Heukelekian, 24 N. J. Super. 407 (App. Div. 1953); In re J. W., 44 N. J. Super. 216 (App. Div.), certif. den., 24 N. J. 465 (1957); In re Perry, 137 N. J. Eq. 161 (Ch. 1945).

The appellant in In re Heukelekian, supra, sought reversal of a declaration of insanity resulting in her commitment to the State Hospital at Marlboro. The trial judge had found that “the evidence by a preponderance of the *276proof established the insanity of the subject.” 24 N. J. Super. at 409. The Appellate Division reversed and remanded, pointing out that to support continued confinement, there had to be a showing that “if the person is liberated she will probably imperil her own safety or the safety or property of others,” with “a reasonable doubt of a person’s insanity [to] be resolved in her favor.” Id.

In re J. W., supra, held that the medical certificate on the basis of which plaintiff was involuntarily confined in a mental hospital was inadequate to prove the requisite mental conditions justifying detention. Judge Conford, citing Perry, supra, wrote “we are bound to seek the clearest legislative authorization before we can accord judicial sanction to the deprivation of personal liberty in a given factual situation,” 44 N. J. Super. at 225-26; and, significantly, “[w]here the right of liberty is involved a reasonable doubt as to the applicability of the statute to the facts presented should be resolved in favor of the subject.” Id. at 226.

In In re Perry, supra, a writ of hateas corpus activated proceedings to secure the release of one confined to the New Jersey State Hospital at Trenton. Vice-Chancellor Jayne was called upon to determine whether the man was sane or insane. Specifically in issue was whether, if liberated, Perry was “likely to appreciably menace the safety of himself or that of the person or property of others.” 137 N. J. Eq. at 164. The court decided he was not, observing that “[e]ertainly with the right of liberty involved, a reasonable doubt of [Perry’s] insanity should be resolved in his favor.” Id.

If these precedents are to be cast aside, as they have been today, they deserve more than a statement of some new standard mentioned almost in passing and conspicuously unencumbered by analysis or exposition of the reasons for its adoption.

One final thought. The trial judge is to make the critical determination of dangerousness. Some may contend that in so doing the judge will likely not differentiate between *277bare preponderance and reasonable donbt, but will merely announce whatever standard happens to comport with his visceral reaction; and that under these circumstances this dissent which emphasizes the distinction between the two burdens of proof is simply theoretical and so much academic claptrap. I think that type of response by a trial judge most unlikely. First, that notion does not square with my confidence in the intellectual honesty of our bench (I look forward to a record in one of these cases wherein the hearing judge reflects on how he makes his decision and lets us know whether he is being given sufficient guidance). Second, the experience in at least one landmark case demonstrated that a trial judge, sitting without a jury, was perfectly capable of differentiating between the requirements of the respective standards. In In re Winship, supra, it is pointed out that “the trial judge’s ability to distinguish between the [reasonable doubt and preponderance] standards enabled him to make a finding of guilt that he conceded he might not have made under the standard of proof beyond a reasonable doubt.” 397 U. S. at 367, 90 S. Ct. at 1074, 25 L. Ed. 2d at 377.

For the reasons presented I dissent from so much of the Court’s opinion as would permit involuntary committees to be “taken from their families and deprived of their constitutionally protected liberty under the same standard of proof applicable to run-of-the-mill automobile negligence actions.” Murel v. Baltimore City Crim. Ct., supra, 407 U. S. at 359, 92 S. Ct. at 2093, 32 L. Ed. 2d at 794 (Douglas, J., dissenting) (footnote omitted).

For reversal and remandment — Chief Justice Hughes, Justices Mountain, Sullivan and Pashman and Judge Coneoed — 5.

Dissenting in part — Justice Clieeobd — 1.

*243The opinion of the Court was delivered by

An acquittal on grounds of insanity, unlike a simple acquittal, does not automatically free the criminal defendant. The governing statute, N. J. S. A. 2A:163-3,1 provides that if the jury finds the defendant not guilty by reason of insanity, it must then make a special finding as to whether defendant’s “insanity continues”; if it finds that defendant’s “insanity” does “continue,” defendant is ordered confined to the Trenton Psychiatric Hospital “until such time as he may be restored to reason.” This confinement is for an indefinite period of time, and may prove permanent, for “restoration to reason” requires not merely remission of acute symptoms but complete cure of the underlying illness or personality disorder. State v. Maik, 60 N. J. 203, 217-18 (1972). A lesser degree of improvement suffices to obtain for defendant only a “conditional release” subject to summary revocation by the court. State v. Carter, 64 N. J. 382 (1974). Defendant challenges the constitutionality of this involuntary commitment procedure.

Stefan Krol stabbed his wife to death in their home. He was indicted for murder and tried in the Superior Court, *244Law Division in Camden County before a jury. Since he did not deny commission of the homicide, the only issue disputed at trial was whether he had been insane at the time of the act. Testimony of psychiatrists who had examined Krol before and after his wife’s death indicated that he was suffering from an acute schizophrenic condition at the time of the killing, and acted under the influence of a powerful delusion that his wife was conspiring with his employer to murder him. The jury returned a verdict of not guilty by reason of insanity and found specially that defendant’s insanity continued. Acting pursuant to N. J. S. A. 2A :163-3, the trial judge ordered defendant committed to the Porensic Psychiatric Unit at Trenton Psychiatric Hospital.

Defendant appealed the commitment order to the Appellate Division, which affirmed. We granted certification, 65 *245N. J. 561 (1974), to consider his contention that the standard for involuntary commitment of persons acquitted on grounds of insanity established by N. J. S. A. 3A:163-3 violates the due process and equal protection clauses of the fourteenth amendment to the federal constitution, a contention which we have not had occasion to consider in our prior decisions on this subject, State v. Maik, supra, and State v. Carter, supra.

I

Prior to considering the merits of this contention, we must first dispose of a procedural issue. On January 17, 1975, while the present matter was pending before this Court, the Camden County Court authorized the conditional release of defendant Krol, as permitted by our decision in State v. Carter, 64 N. J. 382 (1974). In granting the release, the court imposed a number of restrictive terms upon Krol: he must reside in a “Home for Sheltered Care” in close proximity to Ancora Psychiatric Hospital, continue psychiatric treatment as an outpatient, report regularly to a probation officer, and regularly inform the court of his condition; his freedom to travel is limited; and his release may be summarily revoked should he not comply with the terms of the conditional release order or should his condition change. Thus while the order released defendant from the physical custody of the State, it continues substantial restraints upon his liberty. Hence the principle, stated in Stizza v. Essex County Juvenile & Domestic Relations Court, 132 N. J. L. 406, 408 (E. & A. 1945), that commitment orders will not be reviewed after the person committed has been released and freed of all restraints upon his liberty and property does not govern this ease. The present appeal is not rendered moot by the order for conditional release. Defendant still has a real and substantial interest in the validity of the original commitment order. Cf. State v. Parmigiani, 65 N. J. 154, 155 (1974); Bower v. State, 135 *246N. J. L. 564, 568-69 (Sup. Ct. 1947); Sibron v. New York, 392 U. S. 40, 50-59, 88 S. Ct. 1889, 20 L. Ed. 2d 917 (1968). Furthermore we have been informed by counsel that the defendant has not been able to obtain a satisfactory halfway house placement and has not in fact been released under the terms of this order, although he has been allowed a somewhat more limited conditional release under the terms of an order of the Camden County Court dated August 1, 1975.

II

Commitment following acquittal by reason of insanity is not intended to be punitive, for, although such a verdict implies a finding that defendant has committed the actus reus, it also constitutes a finding that he did so without a criminal state of mind. There is, in effect, no crime to punish. State v. Carter, supra, 64 N. J. at 401; State v. Stern, 40 N. J. Super. 291, 296 (App. Div. 1956). The rationale for involuntarily committing such persons pursuant to N. J. S. A. 2A:163-3 is, rather, to protect society against individuals who, through no culpable fault of their own, pose a threat to public safety. Chief Justice Weintraub succinctly explained the purpose of this procedure in his opinion in State v. Maik, supra, 60 N. J. at 213:

For present purposes it is enough to say that all the doctrines which would excuse an offender from criminal accountability because of insanity have the common characteristic of attempting to distinguish between the sick and the bad.

The point to be stressed is that in drawing a line between the sick and the bad, there is no purpose to subject others to harm at the hands of the mentally ill. On the contrary, the aim of the law is to protect the innocent from injury by the sick as well as the bad.

The anomaly of the procedure established by N. J. S. A. 2A:163-3 is that although its ultimate object is to 11rnfeet society against certain individuals who may pose *247special risk of danger, it does not at any point provide for inquiry by judge or jury into the question of 'whether the particular defendant involved in fact poses such a risk. The standard for commitment is simply that defendant’s “insanity continues.” The fact that defendant is presently suffering from some degree of mental illness and that at some point in the past mental illness caused him to commit a criminal act, while certainly sufficient to give probable cause to inquire into whether he is dangerous, does not, in and of itself, warrant the inference that he presently poses a significant threat of harm, either to himself or to others.2

The consequence of this procedure is that a defendant who, despite the fact he still suffers some degree of mental illness, poses no significant danger to society, may nevertheless be deprived of his liberty for an indefinite period of time because dangerousness is, in effect, presumed from continuing insanity. The problem is most acute when the offense which defendant has committed is one which, although violating social norm, did not itself involve dangerous be*248havior. But even where, as in this case, the crime is a violent one, the procedure contains great potential for individual injustice.

This defect, which involves serious infringement upon personal liberty, is one of constitutional dimensions. Constitutional principles of due process require that any state action bear a reasonable relationship to some legitimate state purpose. In Jackson v. Indiana, 406 U. S. 715, 92 S. Ct. 1845, 32 L. Ed. 2d 435 (1972), the United States Supreme Court, applying this principle to involuntary commitment proceedings, held that the standard for commitment must bear a reasonable relationship to the ostensible purpose for which the individual is committed. That decision, which involved the commitment for incompetency to stand trial of a mentally deficient deaf-mute accused of armed robbery, did not restrict the purposes for which the state might involuntarily commit individuals accused of crime; it did require that the state tailor its standard for commitment to whatever purpose it was nominally attempting to advance. Cf. Davy v. Sullivan, 354 F. Supp. 1320, 1329-30 (M. D. Ala. 1973) (holding that persons confined as sexual psychopaths must be released if their confinement is not within the nominal purpose of the statute — protection 'of the public and treatment). Eurthermore, the state must make a meaningful factual determination as to whether defendant actually meets the standard for commitment. Jackson v. Indiana, supra 406 U. S. at 738-39, 92 S. Ct. 1845; Specht v. Patterson, 386 U. S. 605, 87 S. Ct. 1209, 18 L. Ed. 2d 326 (1967); Bolton v. Harris, 130 U. S. App. D. C. 1, 395 F. 2d 642 (D. C. Cir. 1968) (commitment following acquittal by reason of insanity); People v. McQuillan, 392 Mich. 511, 529-34, 221 N. W. 2d 569, 577-79 (Sup. Ct. 1974) (same); State ex rel. Kovach v. Schubet, 64 Wis. 2d 612, 623, 219 N. W. 2d 341, 347 (Sup. Ct. 1974), appeal dismissed 419 U. S. 1117, 95 S. Ct. 799, 42 L. Ed. 2d 817 (1975) (same). The state *249may not simply presume essential adjudicatory facts. Cf. Cleveland Bd. of Ed. v. La Fleur, 414 U. S. 632, 644-46, 94 S. Ct. 791, 39 L. Ed. 2d 52 (1974); Vlandis v. Kline, 412 U. S. 441, 446, 93 S. Ct. 2230, 37 L. Ed. 2d 63 (1972); Stanley v. Illinois, 405 U. S. 645, 92 S. Ct. 1208, 31 L. Ed. 2d 551 (1972); Bell v. Burson, 402 U. S. 535, 91 S. Ct. 1586, 29 L. Ed. 2d 90 (1971).

Since N. J. S. A. 2A:163-3 is designed to protect the public against the risk of future dangerous behavior by persons acquitted by reason of insanity who are still suffering from mental illness, State v. Maik, supra, the principles of due process enunciated in Jackson and like cases require that the standard for commitment be cast in terms of continuing mental illness and dangerousness to self or others, not in terms of continuing insanity alone, and that some trier of fact make a meaningful determination as to whether defendant is actually within these standards.3

*250Ill

This conclusion is also compelled by considerations of equal protection.

In Baxstrom v. Herold, 383 U. S. 107, 86 S. Ct. 760, 15 L. Ed. 2d 620 (1966), the Supreme Court held that prisoners who had allegedly developed mental illness while incarcerated and who were, as a result, being involuntarily committed to mental institutions, were entitled under the equal protection clause to substantially the same procedural protections as other persons subject to involuntary civil commitment. Among other things, Baxstrom held that the same standard for commitment to a particular mental institution had to be applied to prisoners and to other persons subject to involuntary civil commitment to that institution. Subsequently, in Jackson v. Indiana, 406 U. S. 715, 92 S. Ct. 1845, 32 L. Ed. 2d 435 (1972), the Court applied the principle of Baxstrom to persons determined to be incompetent to stand trial on criminal charges. It held that, except for a short observation period, a state cannot commit such a person unless it applies the same standards for commitment to him as it does to other persons involuntarily committed.

While neither of these cases deals specifically with the problem of involuntary commitment of persons acquitted by reason of insanity, the Supreme Court in these opinions has plainly attempted to enunciate a broad principle — that the fact that the person to be committed has previously engaged in criminal acts is not a constitutionally *251acceptable basis for imposing upon him a substantially different standard or procedure for involuntary commitment. The labels “criminal commitment” and “civil commitment” are of no constitutional significance. In Jackson v. Indiana, supra at 406 U. S. 724-25, 92 S. Ct. 1845, the Supreme Court clearly indicated that it regarded this principle as one to be applied very broadly throughout the spectrum of various forms of involuntary commitment, including commitment of persons acquitted by reason of insanity.

The principles of Baxstrom and Jackson have been -widely applied by the state courts and the lower federal courts to overturn procedures for involuntary commitment of persons acquitted by reason of insanity which deviate substantially from those applied to civil commitments generally. E. g., Bolton v. Harris, 130 U. S. App. D. C. 1, 395 F. 2d 642 (D. C. Cir. 1968); Reynolds v. Neill, 381 F. Supp. 1374 (N. D. Texas 1974) (three-judge court), vacated and remanded, sub nom. Sheldon v. Reynolds, 422 U. S. 1050, 95 S. Ct. 2671, 45 L. Ed. 2d 703 (1975); State v. Clemons, 110 Ariz. 79, 515 P. 2d 324 (Sup. Ct. 1973); In re Franklin, 7 Cal. 3d 126, 101 Cal. Rptr. 553, 496 P. 2d 465 (1972); Mills v. State, 256 A. 2d 752 (Del. Sup. Ct. 1969); People v. McQuillan, 392 Mich. 511, 221 N. W. 2d 569 (Sup. Ct. 1974); State ex rel. Kovach v. Schubert, 64 Wis. 2d 612, 219 N. W. 2d 341 (Sup. Ct. 1974), appeal dismissed 419 U. S. 1117, 95 S. Ct. 799, 42 L. Ed. 2d 817 (1975); State ex rel. Walker v. Jenkins, 203 S. E. 2d 353 (W. Va. Sup. Ct. 1974) (semble). Cf. Commonwealth ex rel. DiEmilio v. Shovlin, 449 Pa. 177, 295 A. 2d 320 (Sup. Ct. 1972). See also Chase v. Kearns, 278 A. 2d 132 (Me. Sup. Ct. 1971); State v. Kee, 510 S. W. 2d 477 (Mo. Sup. Ct. 1974).

In Bolton v. Harris, supra, the U. S. Appeals Court struck down the District of Columbia automatic commitment statute, holding, among other things, that the standard for involuntary commitment of persons acquitted by reason *252of insanity must be substantially the same as that generally applied to persons civilly committed. Id. at 651 n. 50. This holding has been followed in People v. McQuillan, supra, and State ex rel. Kovach v. Schubert, supra. Cf. State ex rel. Walker v. Jenkins, supra.

The standard for involuntary civil commitment in New Jersey is set out in N. J. S. A. 30:4-44:

If the patient shall be found not to be suffering from a mental illness, the court shall direct his discharge forthwith.

“Mental illness” is defined in N. J. S. A. 30:4-23:

“Mental illness” shall mean disease to such an extent that a person so afflicted requires care and treatment for his own welfare, or the welfare of others, or of the community.

Prior to 1965, when the present statutes were enacted, New Jersey courts consistently held that a person could not be involuntarily committed unless, if permitted to remain at large, he would probably imperil his own safety or the safety or property of others. In re Heukelekian, 24 N. J. Super. 407, 409 (App. Div. 1953). Accord, Aponte v. State, 30 N. J. 441, 450 (1959); DiGiovanni v. Pessel, 104 N. J. Super. 550, 572 (App. Div. 1969), mod. on other grounds 55 N. J. 188 (1970); In re J. W., 44 N. J. Super. 216, 226 (App. Div. 1957), certif. den. 24 N. J. 465 (1957); In re R. R., 140 N. J. Eq. 371 (Ch. 1947). Although N. J. S. A. 30:4-44 has not been construed since the 1965 amendments, N. J. S. A. 30:4-82, which incorporates the same definitions, was construed in State v. Caralluzzo, 49 N. J. 152, 156 n. 1 (1967), to continue to mean “dangerous to self or to society” and we understand that to be the proper construction of the civil commitment statute, N. J. S. A. 30:4-44. Hence, if equal protection requires the standard for involuntary commitment of persons acquitted by reason of insanity to be identical to that applicable to civil commitment proceed*253ings generally, defendant may be committed only if lie has been determined to be both mentally ill and dangerous to himself or to society.

Constitutional principles of equal protection, however, do not require that all persons be treated identically. They require only that any differences in treatment be justified by an appropriately strong state interest.

Under the so-called “two-tiered” analysis of the federal equal protection clause, the state need show only a rational basis for its classification, unless it involves “invidious” standards or infringes upon “fundamental” rights, in which case it must show a “compelling state interest.” San Antonio Independent School District v. Rodriguez, 411 U. S. 1, 15, 93 S. Ct. 1278, 36 L. Ed. 2d 16 (1973). The Supreme Court, in deciding Jackson v. Indiana and Baxstrom v. Herold, has not clearly indicated whether differences in commitment procedure between those applicable to persons acquitted by reason of insanity and those applicable to other persons subject to civil commitment must be justified by a “compelling state interest” or whether some lesser interest will suffice. State courts considering the question have divided. Compare State v. Kee, supra, 510 S. W. 2d at 481-82 (rational basis) with People v. McQuillan, supra, 221 N. W. 2d at 579 n. 4 (compelling state interest). It has even been suggested that Jackson v. Indiana, supra represents an abandonment of the “two-tiered” analysis. Nowak, “Realigning the Standards of Review Under the Equal Protection Guarantees — Prohibited, Neutral and Permissive Classifications,” 62 Geo. L. Rev. 1071 (1974).

Fortunately, we need not leap into this bramble bush to decide the present case. The distinction between the standard for involuntary commitment for persons acquitted by reason of insanity and other persons lacks even a rational basis.

The State argues that persons acquitted by reason of insanity pose a special hazard to the public because *254they have been convicted of committing a criminal act and have proven by a preponderance of the evidence that the act resulted from mental illness, State v. DiPaglia, 64 N. J. 288 (1974), and that therefore they constitute an “exceptional class” of persons in whose confinement and treatment the State has a special interest. Accepting arguendo the factual assumption upon which this claim is predicated — that persons acquitted by reason of insanity pose a greater hazard to the public than other mentally ill persons4 — the argument does not support a claim that the State should not be required to establish that the particular defendant poses a danger to himself or society. The State does not claim that it would be more burdensome to determine whether persons such as defendant are dangerous than it is generally for persons subject to civil commitment. Its contention that, as a class, persons acquitted by reason of insanity are more likely to be dangerous than other persons, does not rationally establish that any particular individual in the class should be confined even if he is not dangerous. Oases which treat persons acquitted by reason of insanity as an “exceptional class” as urged by the State, e. g., Mills v. State, supra; Chase v. Kearns, supra; State v. Kee, supra, have not done so in response to a contention that persons acquitted by reason of insanity must be shown to be dangerous to be involuntarily committed but rather in response to a contention that it must be shown that such persons are mentally ill, a matter not in dispute in this case. Such cases hold that persons acquitted by reason of insanity may be committed without a fresh determination of mental illness because they have proven insanity at the time of the crime by a preponderance of the evidence and insanity is presumed to continue. *255Such arguments, whose soundness is doubtful at best,5 see, Note 74 Colum. L. Rev. 733, 746-50 (1974), are not pertinent to the contention that like other persons subject to involuntary commitment, persons acquitted by reasons of insanity may not be committed without a showing of dangerousness. Johnson v. Robinson, 509 F. 2d 395, 399 n. 18 (D. C. Cir. 1974) (dictum). The decisive consideration where personal liberty is involved is that each individual’s fate must be adjudged on the facts of his own case, not on the general characteristics of a “class” to which he may be assigned.

IY

Having determined that the commitment provisions of N. J. S. A. 2A:163-3 (and N. J. S. A. 2A:163-2) are unconstitutional in that they authorize involuntary commitment without proof of dangerousness,6 the Court cannot simply stop short. Eevision of the procedure for disposition of persons acquitted by reason of insanity is ultimately a matter for the Legislature. In the interim, the Court must itself formulate a constitutional and workable procedure. In doing so, we do not claim that the procedures *256which we adopt constitute either the only acceptable alternative or the best one. They are simply expedients to enable the machinery of justice to continue to function pending action by the Legislature.

Eollowing acquittal by reason of insanity, the defendant may, at the request of the State, be confined in a suitable mental institution for a period of 60 days for observation and examination. Proof by defendant that his criminal conduct was the result of mental illness provides sufficient justification for holding him in custody for a reasonable period of time to determine if he in fact should be indefintely committed. Such procedures for automatic temporary commitment, even though deviating from procedures applicable to civil commitment generally, have uniformly been upheld. See, e. g., Bolton v. Harris, 130 U. S. App. D. C. 1, 395 F. 2d 642, 651 (D. C. Cir. 1969); State v. Clemons, 110 Ariz. 79, 84, 515 P. 2d 324, 328 (Sup. Ct. 1973); In re Franklin, 7 Cal. 3d 126, 141-43, 101 Cal. Rptr. 553, 562-64, 496 P. 2d 465, 474-76 (Sup. Ct. 1972); People v. McQuillan, 392 Mich. 511, 524-30, 221 N. W. 2d 569, 575-77 (Sup. Ct. 1974). See generally, Hamann, "The Confinement and Release of Persons Acquitted by Reason of Insanity,” 4 Harv. J. Leg. 55, 65-67 (1966); Annotation "Validity of statutory provisions for commitment to mental institution of one acquitted on grounds of insanity without formal determination of mental condition at time of acquittal,” 50 A. L. R. 3d 144 (1973). While judicial decisions and scholarly commentators have differed on the most appropriate maximum to place on this period of temporary commitment, 60 days appears to be within the range of reasonableness.7

*257 Within, this period, the State may move for indefinite commitment on the ground that defendant is mentally ill8 and, if permitted to remain at large in the general population without some restraints, is likely to pose a danger to himself or to society. If, following a hearing, the court finds that the State has shown by a preponderance of the evidence9 that defendant is mentally ill and is likely to pose such a danger, it should order suitable restraints placed upon defendant’s liberty so as to protect the public and provide defendant with appropriate treatment. Such an order may take the form of confinement to an appropriate mental institution or other lesser restraints upon defendant’s liberty — participation in a residential half-way house program, mandatory out-patient care, etc. The order should be molded so as to protect society’s very strong interest in public safety hut to do so in a fashion that reasonably minimizes infringements upon defendant’s liberty and autonomy *258and gives him the best opportunity to receive appropriate care and treatment.10

In establishing a standard for commitment based on dangerousness as well as mental illness, we are cognizant of the difficulties which inhere in such a standard, a problem which we discussed in some depth in our recent decision in State v. Carter, 64 N. J. 382, 404-05 (1974). Dangerousness is a concept which involves substantial elements of vagueness and ambiguity, see, e. g., Goldstein & Katz, “Dangerousness and Mental Illness: Some Observation on the Decision to Release Persons Acquitted by Reason of Insanity,” 70 Yale L. J. 224, 235-36 (1960), Rubin, “Prediction of Dangerousness in Mentally 111 Criminals,” 27 Arch. Gen. Psychiat. 397, 398-99 (1972). The practical applica*259tion of a dangerousness standard is further impeded by the difficulty of making valid and meaningful predictions of the likelihood of future harmful conduct, see, e. g., Diamond, “The Psychiatric Prediction of Dangerousness,” 123 U. Pa. L. Rev. 439 (1974); “Developments — Civil Commitment of the Mentally Ill,” 87 Harv. L. Rev. 1190, 1240-45 (1974); Rubin, supra, and by the subtle but strong pressures upon decision makers to overpredict dangerousness. See, e. g., Diamond, supra, at 447; Rubin, supra; Dershowitz, “The Law of Dangerousness: Some Dictions about Predictions,” 23 J. Legal Ed. 24 (1970). To a considerable extent, these are problems which can be dealt with only by trial judges on a case by case basis. An appellate court can only suggest guidelines for analysis.

The standard is “dangerous to self or society.”11 Dangerous conduct is not identical with criminal conduct. Dangerous conduct involves not merely violation of social norms enforced by criminal sanctions, but significant physical or psychological injury to persons or substantial destruction of property. Persons are not to be indefinitely incarcerated because they present a risk of future conduct which is merely socially undesirable. Personal liberty and autonomy are of too great value to be sacrificed to protect society against the possibility of future behavior which some may find odd, disagreeable, or offensive, or even against the possibility of future non-dangerous acts which would be ground for criminal prosecution if actually committed. Unlike inanimate objects, people cannot be suppressed simply because they may become public nuisances. State v. Carter, supra 64 N. J. at 405; O'Connor v. Donaldson, 422 U. S. *260563, 95 S. Ct. 2486, 45 L. Ed. 2d 396 (1975); Cross v. Harris, 135 U. S. App. D. C. 259, 418 F. 2d 1095, 1102 (D. C. Cir. 1969); Davy v. Sullivan, 354 F. Supp. 1320, 1330 (M. D. Ala. 1973) (three-judge court). Cf. Millard v. Harris, 132 U. S. App. D. C. 146, 406 F. 2d 964 (D. C. Cir. 1968).

Commitment requires that there be a substantial risk of dangerous conduct within the reasonably foreseeable future. Evaluation of the magnitude of the risk involves consideration both of the likelihood of dangerous conduct and the seriousness of the harm which may ensue if such conduct takes place. Cross v. Harris, supra, 1100-1101; “Developments — Civil Commitment of the Mentally Ill,” 87 Harv. L. Rev. 1190, 1236-40 (1974); Livermore, Malinquist & Mechl, “On the Justification for Civil Commitment,” 115 U. Pa. L. Rev. 75, 81-83 (1968); Goldstein & Katz, supra at 235. It is not sufficient that the state establish a possibility that defendant might commit some dangerous acts at some time in the indefinite future. The risk of danger, a product of the likelihood of such conduct and the degree of harm which may ensue, must be substantial within the reasonably foreseeable future. On the other hand, certainty of prediction is not required and cannot reasonably be expected.

A defendant may be dangerous in only certain types of situations or in connection with relationships with certain individuals. An evaluation of dangerousness in such cases must take into account the likelihood that defendant will be exposed to such situations or come into contact with such individuals. Cross v. Harris, supra at 1101. See State v. Johnson, 8 Or. App. 263, 493 P. 2d 1386 (Ct. App. 1972) (defendant potentially dangerous to her children but was unlikely to have access to them); see generally, Diamond, supra at 449.

Determination of dangerousness involves prediction of defendant’s future conduct rather than mere characteri*261zation of Ms past conduct. Nonetheless, defendant’s past conduct is important evidence as to his prohahle future conduct. Cf. In re Miller, 73 Misc. 2d 690, 702, 342 N. Y. S. 2d 315, 330 (N. Y. Cty. Ct. 1972). It is appropriate for the court to give substantial weight to the nature and seriousness of the crime committed by defendant and its relationship to his present mental condition.12

It should be emphasized that while courts in determining dangerousness should take full advantage of expert testimony presented by the State and by defendant, the decision is not one that can he left wholly to the technical expertise of the psychiatrists and psychologists. The determination of dangerousness involves a delicate balancing of society’s interest in protection from harmful conduct against the individual’s interest in personal liberty and autonomy. This decision, while requiring the court to make use of the assistance which medical testimony may provide, is ultimately a legal one, not a medical one. Humphrey v. Cady, 405 U. S. 504, 509, 92 S. Ct. 1048, 31 L. Ed. 2d 394 (1972); Dixon v. Jacobs, 138 U. S. App. D. C. 319, 427 F. 2d 589, 595 n. 17 (D. C. Cir. 1970).

Once the court has determined that defendant is mentally ill and is dangerous to himself or others, it must formulate an appropriate order. As we noted in State v. Carter, supra, this is an exceedingly difficult task, one calling for a high degree of judicial flexibility and imagination. The object of the order is to impose that degree of restraint upon defendant necessary to reduce the risk of danger which he poses to an acceptable level. Doubts must be resolved in favor of protecting the public, hut the court should not, by *262its order, infringe upon defendant’s liberty or autonomy any more than appears reasonably necessary to accomplish this goal. Nonetheless, where the public cannot be adequately protected by any practical lesser restraint, the court is justified in ordering defendant institutionalized in an appropriate public psychiatric hospital. Court imposed restraints must, of course, always be coupled with a corresponding opportunity for care and treatment. State v. Carter, supra 64 N. J. at 393-94; In re D. D., 118 N. J. Super. 1, 6 (App. Div. 1966). Cf. O’Connor v. Donaldson, 422 U. S. 563, 95 S. Ct. 2486, 45 L. Ed. 2d 396 (1975); Wyatt v. Stickney, 325 F. Supp. 781 (M. D. Ala. 1971), aff’d sub nom. Wyatt v. Aderholt, 503 F. 2d 1305 (5 Cir. 1974).

In evaluating the possibility of imposing restraints less severe than complete institutionalization the considerations discussed in State v. Carter, supra, 64 N. J. at 403-04 in connection with conditional release are pertinent and should be taken into account:

The court’s inquiry as to conditional release must be as broad as possible. Good patients may be bad risks. The disposition must be individualized with the focus on the offender, not the offense he committed, although such offense can serve as an indication of the harm the patient is capable of inflicting. Perhaps most important is the establishment of psychiatric out-patient care. The conditions under which the patient will live after release should certainly be conducive to his recovery, or at the very least, not aggravate his condition. His family life and friends, the area in which he lives and work that he could obtain, if it would be helpful, are all relevant. See generally, Weihofen, supra.

The success of conditional release depends, to a large extent, upon the adequacy of the supervisory controls imposed by the courts to insure the public safety. The most obvious condition for safeguarding the community against a repetition of criminal behavior is a careful follow-up and required attendance for psychiatric treatment over a long period of time. Of course, the frequency of visits to the treating psychiatrist would depend upon the individualized circumstances of each case. But, in any event, the psychiatrist must continuously evaluate the patient’s adjustment and be able to anticipate, and thus prevent psychotic episodes. Plainly, the patient must be a fit subject for out-patient treatment. Psychiatric treatment under the compulsion of a court order without the willing cooperation of the patient would obviously be counter-productive.

*263 Orders, either requiring institutionalization ox imposing lesser restraints are subject to modification on grounds that defendant has become more or less dangerous than he was previously, or termination, on the grounds that he is no longer mentally ill and dangerous, on the motion of either the State or the defendant.13 Where the court has probable cause to believe that a non-institutionalized defendant poses an imminent danger to himself or others, whether because the original restraints have proven inadequate, because defendant has not complied with the terms of the order, or because defendant’s condition has changed, it may order defendant temporarily institutionalized for further observation and evaluation pending proceedings for modification of the prior order. Where defendant is temporarily institutionalized under such circumstances, a hearing on modification of the order should be conducted as promptly as is practical. Once, however, the commitment *264order is unconditionally terminated, the defendant must he treated thereafter like any other person for purposes of involuntary commitment. He may be committed only by institution of appropriate civil commitment proceedings under N. J. S. A. 30:A-23 et seq.

We have chosen to separate determination as to whether defendant may be involuntarily committed from determination by the jury of guilt or innocence and placed the former question wholly in the hands of the trial judge, for decision after the trial, for two reasons.14 Eirst, proofs pertinent to the likelihood of harmful conduct by defendant in the future are altogether different in substance and character from those pertinent to guilt or innocence or to defendant’s insanity plea. Introduction of such proofs at trial creates a significant risk that the jury may be confused or may be distracted from proper consideration of guilt or innocence, the principal question before it. Second, requiring defendant to simultaneously argue to the jury both that he was insane at the time of the crime and that he is no longer mentally ill or dangerous places him in a difficult and unfair tactical position. He may reasonably fear that the jury will be very loath to reach a verdict of not guilty by reason of insanity if he successfully demonstrates that he is no longer dangerous and must be released upon such a verdict. This fear may well deter him from vigorously arguing present sanity and lack of dangerousness under such circumstances. In re Franklin, supra 101 Cal. Rptr. at 558, 496 P. 2d at 470; cf. Wiehofen, “Institutional Treatment of Persons Acquitted by Reason of Insanity,” 38 Texas L. Rev. 849, 850 (1960). Separating the issues frees defendant from this *265potential unfairness. We re-emphasize that this is merely an interim procedure adopted by the Court and is not to be understood as constitutionally compelled. See State ex rel. Kovach v. Schubert, 64 Wis. 2d 612, 219 N. W. 2d 341 (Sup. Ct. 1974), appeal dismissed 419 U. S. 1117, 95 S. Ct. 799, 42 L. Ed. 2d 817 (1975).

At the initial trial the jury should no longer be instructed to render a special verdict as to whether defendant’s insanity continues. The trial judge should, however, instruct the jury as to the consequences of a verdict of not guilty by reason of insanity so that the jury does not act under the mistaken impression that defendant will necessarily be freed or be indefinitely committed to a mental institution. See Bolton v. Harris, supra at 651 n. 50. See generally Lyles v. United States, 103 U. S. App. D. C. 22, 254 F. 2d 725, 728-29 (D. C. Cir. 1957), cert. denied 356 U. S. 961, 78 S. Ct. 997, 2 L. Ed. 2d 1067 (1958), 362 U. S. 943, 80 S. Ct. 809, 4 L. Ed. 2d 771 (1960), 368 U. S. 992, 82 S. Ct. 610, 7 L. Ed. 2d 529 (1962); Commonwealth v. Mutina, Mass., 323 N. E. 2d 294 (1975).

Y

In the interests of clarity, it is appropriate for us to attempt to delineate the relationship between our decision today and our prior decisions in State v. Maik, 60 N. J. 203 (1971), and State v. Carter, 64 N. J. 382 (1974). In State v. Maik, supra, the Court, speaking through Chief Justice Weintraub, definitively construed the commitment provisions of N. J. S. A. 2A:163-2 and 2A:163-3. Id. 60 N. J. at 216-21. The constitutionality of these provisions was not challenged by the parties in that case and was not considered by the Court in its decision. We now conclude that the standards for commitment established in N. J. S. A. 2A:163-2 and N. J. S. A. 2A:163-3, as construed by the Court in State v. Mailc, supra, are unconstitutional, and, to that extent, the decision in State v. Mailc is overruled.

*266In State v. Carter, supra, the Court further elaborated the principles enunciated in State v. Maik, supra, and extended them to permit conditional release of persons committed under N. J. S. A. 2A:163-2 or N. J. S. A. 2A:163-3. The majority had no occasion in its opinion to consider possible challenges to the provisions of N. J. S. A. 2A:163-2 and N. J. S. A. 2A:163-3 on constitutional grounds. Since the decision in State v. Carter is predicated upon, and is an elaboration of, the construction of these commitment provisions set out in State v. Maik, the specific holdings in that ease are superseded, but only to the extent inconsistent with this opinion, and particularly by our conclusion today that these provisions are unconstitutional.

VI

Defendant in the present case did not receive the type of hearing outlined above at the time of his commitment. No inquiry was made at that time into whether he was in fact dangerous to himself or others. He has since been granted a conditional release under State v. Carter, 64 N. J. 382 (1974). He is, nonetheless, entitled to a hearing within 60 days as to whether he is mentally ill and, whether, if permitted to remain at large in the general population without some restraints, he is likely to pose a danger to himself or to society.

VII

The final question to be decided is whether today’s holding should be applied retroactively to other persons who are presently confined to State mental institutions following acquittal by reason of insanity. The decision to give such a holding retroactive or prospective effect is one that must depend upon a balancing of the interests of the State and the individuals affected. State v. Nash, 64 N. J. 464, 471 (1974); *267State v. Johnson, 43 N. J. 572 (1965), aff’d 384 U. S. 719, 86 S. Ct. 1772, 16 L. Ed. 2d 882 (1966); Linkletter v. Walker, 381 U. S. 618, 85 S. Ct. 1731, 14 L. Ed. 2d 601 (1965); cf. Darrow v. Hanover Tp., 58 N. J. 410 (1971).

Persons who have been involuntarily committed to mental institutions under an improper standard suffer continuing injury, which may extend indefinitely into the future. The effect of today’s decision is not to cast doubt merely upon the adequacy of procedural safeguards surrounding the decision to commit, see State v. Johnson, supra, but upon the correctness of the very decision itself. Fairness demands that further confinement of a person presently committed be conditioned upon a showing by the State that he can in fact be committed under constitutionally proper standards. Since the number of persons involved is comparatively small,15 applying this holding retroactively poses little danger that the administration of justice will be impaired or excessively burdened. See generally State v. Nash, supra.

We therefore conclude that today’s holding should be applied retroactively to persons presently committed to State mental institutions (or conditionally released from such institutions pursuant to State v. Carter, supra) following acquittal by reason of insanity, and that, like the defendant, they are entitled to commitment hearings within 60 days. Cf. Smith v. Robey, 57 Mich. App. 630, 226 N. W. 2d 593 (Ct. App. 1975).

Reversed and remanded.