The Court concludes that because Anita Isaacs’ testimony at respondent’s preliminary hearing was subjected to the equivalent of significant cross-examination, such hearsay evidence bore sufficient “indicia of reliability” to permit its introduction at respondent’s trial without offending the Confrontation Clause of the Sixth Amendment. As the Court recognizes, however, the Constitution imposes the threshold requirement that the prosecution must demonstrate the unavailability of the witness whose prerecorded testimony it wishes to use against the defendant. Because I cannot agree that the State has met its burden of establishing this predicate, I dissent.1

*78“There are few subjects, perhaps, upon which this Court and other courts have been more nearly unanimous than in their expressions of belief that the right of confrontation and cross-examination is an essential and fundamental requirement for the kind of fair trial which is this country’s constitutional goal.” Pointer v. Texas, 380 U. S. 400, 405 (1965). Accord, Berger v. California, 393 U. S. 314, 315 (1969); Barber v. Page, 390 U. S. 719, 721 (1968); Pointer v. Texas, supra, at 410 (Stewart, J., concurring); Kirby v. United States, 174 U. S. 47, 55-56 (1899). Historically, the inclusion of the Confrontation Clause in the Bill of Rights reflected the Framers’ conviction that the defendant must not be denied the opportunity to challenge his accusers in a direct encounter before the trier of fact. See California v. Green, 399 U. S. 149, 156-158 (1970); Park v. Huff, 506 F. 2d 849, 861-862 (CA5 1975) (Gewin, J., concurring). At the heart of this constitutional guarantee is the accused’s right to compel the witness “to stand face to face with the jury in order that they may look at him, and judge by his demeanor upon the stand and the manner in which he gives his testimony whether he is worthy of belief.” Mattox v. United States, 156 U. S. 237, 242-243 (1895). See also California v. Green, supra, at 174-183 (Harlan, J., concurring).

Despite the literal language of the Sixth Amendment,2 our cases have recognized the necessity for a limited exception to the confrontation requirement for the prior testimony of a witness who is unavailable at the defendant’s trial. In keeping with the importance of this provision in our constitutional scheme, however, we have imposed a heavy burden on the prosecution either to secure the presence of the witness or to *79demonstrate the impossibility of that endeavor. Barber v. Page, supra, held that the absence of a witness from the jurisdiction does not excuse the State’s failure to attempt to compel the witness’ attendance at trial; in such circumstances, the government must show that it has engaged in a diligent effort to locate and procure the witness’ return. “In short, a witness is not ‘unavailable’ for purposes of the foregoing exception to the confrontation requirement unless the prosecu-torial authorities have made a good-faith effort to obtain his presence at trial.” Id., at 724-725. See, e. g., United States v. Mann, 590 F. 2d 361, 367 (CA1 1978); United States v. Lynch, 163 U. S. App. D. C. 6, 18-19, 499 F. 2d 1011, 1023-1024 (1974); Government of the Virgin Islands v. Aquino, 378 F. 2d 540, 549-552 (CA3 1967). See generally 5 J. Wig-more, Evidence § 1405 (J. Chadbourn rev. 1974) and cases cited therein.

In the present case, I am simply unable to conclude that the prosecution met its burden of establishing Anita Isaacs’ unavailability. From all that appears in the record — and there has been no suggestion that the record is incomplete in this respect — the State’s total effort to secure Anita’s attendance at respondent’s trial consisted of the delivery of five subpoenas in her name to her parents’ residence, and three of those were issued after the authorities had learned that she was no longer living there.3 At least four months before the trial began, the prosecution was aware that Anita had moved away; yet during that entire interval it did nothing whatsoever to try to make contact with her. It is difficult to believe that the State would have been so derelict in attempting to secure the witness’ presence at trial had it not had her *80favorable preliminary hearing testimony upon which to rely in the event of her “unavailability.” The perfunctory steps which the State took in this case can hardly qualify as a “good-faith effort.” In point of fact, it was no effort at all.

The Court, however, is apparently willing to excuse the prosecution’s inaction on the ground that any endeavor to locate Anita Isaacs was unlikely to bear fruit. See ante, at 75-76. I not only take issue with the premise underlying that reasoning — that the improbability of success can condone a refusal to conduct even a cursory investigation into the witness’ whereabouts — but I also seriously question the Court’s conclusion that a bona fide search in the present case would inevitably have come to naught.

Surely the prosecution’s mere speculation about the difficulty of locating Anita Isaacs cannot relieve it of the obligation to attempt to find her. Although the rigor of the undertaking might serve to palliate a failure to prevail, it cannot justify a failure even to try. Just as Barber cautioned that “ ‘the possibility of a refusal is not the equivalent of asking and receiving a rebuff,’ ” 390 TJ. S., at 724 (quoting the decision below, 381 F. 2d 479, 481 (CA10 1966) (Aldrich, J., dissenting)), so, too, the possibility of a defeat is not the equivalent of pursuing all obvious leads and returning empty-handed. The duty of “good-faith effort” would be meaningless indeed “if that effort were required only in circumstances where success was guaranteed.” Mancusi v. Stubbs, 408 U. S. 204, 223 (1972) (Marshall, J., dissenting).

Nor do I concur in the Court’s bleak prognosis of the likelihood of procuring Anita Isaacs’ attendance at respondent’s trial.4 Although Anita’s mother testified that she had no *81current knowledge of her daughter’s whereabouts, the prosecution possessed sufficient information upon which it could have at least initiated an investigation. As the Court acknowledges, one especially promising lead was the San Francisco social worker to whom Mrs. Isaacs had spoken and with whom Anita had filed for welfare. What the Court fails to mention, however, is that the prosecution had more to go on than that datum alone. For example, Mrs. Isaacs testified that on the same day she talked to the social worker, she also spoke to her daughter. And although Mrs. Isaacs told defense counsel that she knew of no way to get in touch with her daughter in an emergency, Tr. 195, in response to a similar question from the prosecutor she indicated that someone in Tucson might be able to contact Anita. Id., at 198-199. It would serve no purpose here to essay an exhaustive catalog of the numerous measures the State could have taken in a diligent attempt to locate Anita. It suffices simply to note that it is not “hindsight,” see ante, at 75, that permits us to envision how a skilled investigator armed with this information (and any additional facts not brought out through the voir dire) 5 might have discovered Anita’s whereabouts *82with reasonable effort. Indeed, precisely because the prosecution did absolutely nothing to try to locate Anita, hindsight does not enhance the vista of investigatory opportunities that were available to the State had it actually attempted to find her.

In sum, what the Court said in Barber v. Page, 390 U. S., at 725, is equally germane here: “[S]o far as this record reveals, the sole reason why [the witness] was not present to testify in person was because the State did not attempt to seek [her] presence. The right of confrontation may not be dispensed with so lightly.”

delivered the opinion of the Court.

This case presents issues concerning the constitutional propriety of the introduction in evidence of the preliminary hearing testimony of a witness not produced at the defendant’s subsequent state criminal trial.

I

Local police arrested respondent, Herschel Roberts, on January 7, 1975, in Lake County, Ohio. Roberts was charged with forgery of a check in the name of Bernard Isaacs, and with possession of stolen credit cards belonging to Isaacs and his wife Amy.

A preliminary hearing was held in Municipal Court on January 10. The prosecution called several witnesses, including Mr. Isaacs. Respondent’s appointed counsel had seen the Isaacs’ daughter, Anita, in the courthouse hallway, and called her as the defense’s only witness. Anita Isaacs testified that she knew respondent, and that she had permitted him to use her apartment for several days while she was away. Defense counsel questioned Anita at some length and attempted to elicit from her an admission that she had given respondent checks and the credit cards without informing him that she did not have permission to use them. Anita, however, denied this. Respondent’s attorney did not ask to have the witness declared hostile and did not request permission to place her on cross-examination. The prosecutor did not question Anita.

A county grand jury subsequently indicted respondent for forgery, for receiving stolen property (including the credit cards), and for possession of heroin. The attorney who represented respondent at the preliminary hearing withdrew upon *59becoming a Municipal Court Judge, and new counsel was appointed for Roberts.

Between November 1975 and March 1976, five subpoenas for four different trial dates1 were issued to Anita at her parents’ Ohio residence. The last three carried a written instruction that Anita should “call before appearing.” She was not at the residence when these were executed. She did not telephone and she did not appear at trial.

In March 1976, the case went to trial before a jury in the Court of Common Pleas. Respondent took the stand and testified that Anita Isaacs had given him her parents’ checkbook and credit cards with the understanding that he could use them. Tr. 231-232. Relying on Ohio Rev. Code Ann. § 2945.49 (1975),2 which permits the use of preliminary examination testimony of a witness who “cannot for any reason be produced at the trial,” the State, on rebuttal, offered the transcript of Anita’s testimony. Tr. 273-274.

Asserting a violation of the Confrontation Clause and, indeed, the unconstitutionality thereunder of § 2945.49, the defense objected to the use of the transcript. The trial court conducted a voir dire hearing as to its admissibility. Tr. 194-199. Amy Isaacs, the sole witness at voir dire, was questioned by both the prosecutor and defense counsel concerning her daughter’s whereabouts. Anita, according to her mother, left home for Tucson, Ariz., soon after the prelimi*60nary hearing. About a year before the trial, a San Francisco social worker was in communication with the Isaacs about a welfare application Anita had filed there. Through the social worker, the Isaacs reached their daughter once by telephone. Since then, however, Anita had called her parents only one other time and had not been in touch with her two sisters, When Anita called, some seven or eight months before trial, she told her parents that she “was traveling” outside Ohio, but did not reveal the place from which she called. Mrs. Isaacs stated that she knew of no way to reach Anita in case of an emergency. App. 9. Nor did she “know of anybody who knows where she is.” Id., at 11. The trial court admitted the transcript into evidence. Respondent was convicted on all counts.

The Court of Appeals of Ohio reversed. After reviewing the voir dire, that court concluded that the prosecution had failed to make a showing of a “good-faith effort” to secure the absent witness’ attendance, as required by Barber v. Page, 390 U. S. 719, 722-725 (1968). The court noted that “we have no witness from the prosecution to testify . . . that no one on behalf of the State could determine Anita’s whereabouts, [or] that anyone had exhausted contact with the San Francisco social worker.” App. 5. Unavailability would have been established, the court said, “[h]ad the State demonstrated that its subpoenas were never actually served on the witness and that they were unable to make contact in any way with the witness. . . . Until the Isaacs’ voir dire, requested by the defense, the State had done nothing, absolutely nothing, to show the Court that Anita would be absent because of unavailability, and they showed no effort having been made to seek out her whereabouts for purpose of trial.” Ibid.

The Supreme Court of Ohio, by a 4-3 vote, affirmed, but did so on other grounds. 55 Ohio St. 2d 191, 378 N. E. 2d 492 (1978). It first held that the Court of Appeals had erred in concluding that Anita was not unavailable. Barber v. Page was distinguished as a case in which “the government knew where *61the absent witness was,” whereas Anita’s “whereabouts were entirely unknown.” 55 Ohio St. 2d, at 194, 378 N. E. 2d, at 495. “[T]he trial judge could reasonably have concluded from Mrs. Isaacs’ voir dire testimony that due diligence could not have procured the attendance of Anita Isaacs”; he “could reasonably infer that Anita had left San Francisco”; and he “could properly hold that the witness was unavailable to testify in person.” Id., at 195, 378 N. E. 2d, at 495-496.

The court, nonetheless, held that the transcript was inadmissible. Reasoning that normally there is little incentive to cross-examine a witness at a preliminary hearing, where the “ultimate issue” is only probable cause, id., at 196, 378 N. E. 2d, at 496, and citing the dissenting opinion in California v. Green, 399 U. S. 149, 189 (1970), the court held that the mere opportunity to cross-examine at a preliminary hearing did not afford constitutional confrontation for purposes of trial. See 55 Ohio St. 2d, at 191, 378 N. E. 2d, at 493 (court syllabus).3 The court distinguished Green, where this Court had ruled admissible the preliminary hearing testimony of a declarant who was present at trial, but claimed forgetfulness. The Ohio court perceived a “dictum” in Green that suggested that the mere opportunity to cross-examine renders preliminary hearing testimony admissible. 55 Ohio St. 2d, at 198, and n. 2, 378 N. E. 2d, at 497, and n. 2, citing 399 U. S., at 165-166. But the court concluded that Green “goes no further than to suggest that cross-examination actually conducted at preliminary hearing may afford adequate confrontation for purposes of a later trial.” 55 Ohio St. 2d, at 199, 378 N. E. 2d, at 497 (emphasis in original). Since Anita had not been cross-examined at the preliminary hearing and was absent at trial, the introduction of the transcript of her testimony was held to have violated respondent’s confrontation *62right. The three dissenting justices would have ruled that “ ‘the test is the opportunity for full and complete cross-examination rather than the use which is made of that opportunity’ ” (citing United States v. Allen, 409 F. 2d 611, 613 (CA10 1969)). 55 Ohio St. 2d, at 200, 378 N. E. 2d, at 498.

We granted certiorari to consider these important issues under the Confrontation Clause. 441 U. S. 904 (1979).

II

A

The Court here is called upon to consider' once again the relationship between the Confrontation Clause and the hearsay rule with its many exceptions. The basic rule against hearsay, of course, is riddled with exceptions developed over three centuries. See E. Cleary, McCormick on Evidence § 244 (2d ed. 1972) (McCormick) (history of rule); id., §§ 252-324 (exceptions).4 These exceptions vary among jurisdictions as to number, nature, and detail. See, e. g., Fed. Rules Evid. 803, 804 (over 20 specified exceptions). But every set of exceptions seems to fit an apt description offered more than 40 years ago: “an old-fashioned crazy quilt made of patches cut from a group of paintings by cubists, futurists and surrealists.” Morgan & Maguire, Looking Backward and Forward at Evidence, 50 Harv. L. Rev. 909, 921 (1937).

The Sixth Amendment’s Confrontation Clause, made applicable to the States through the Fourteenth Amendment, Pointer v. Texas, 380 U. S. 400, 403-405 (1965); Davis v. Alaska, 415 U. S. 308, 315 (1974), provides: “In all criminal prosecutions, the accused shall enjoy the right ... to be con*63fronted with the witnesses against him.” If one were to read this language literally, it would require, on objection, the exclusion of any statement made by a declarant not present at trial. See Mattox v. United States, 156 U. S. 237, 243 (1895) (“[Tjhere could be nothing more directly contrary to the letter of the provision in question than the admission of dying declarations”). But, if thus applied, the Clause would abrogate virtually every hearsay exception, a result long rejected as unintended and too extreme.

The historical evidence leaves little doubt, however, that the Clause was intended to exclude some hearsay. See California v. Green, 399 U. S., at 156-157, and nn. 9 and 10; see also McCormick § 252, p. 606. Moreover, underlying policies support the same conclusion. The Court has emphasized that the Confrontation Clause reflects a preference for face-to-face confrontation at trial,5 and that “a primary interest secured by [the provision] is the right of cross-examination.” Douglas v. Alabama, 380 U. S. 415, 418 (1965).6 In short, the Clause envisions

“a personal examination and cross-examination of the *64witness in which the accused has an opportunity, not only of testing the recollection and sifting the conscience of the witness, but of compelling him to stand face to face with the jury in order that they may look at him, and judge by his demeanor upon the stand and the manner in which he gives his testimony whether he is worthy of belief.” Mattox v. United States, 156 U. S., at 242-243.

These means of testing accuracy are so important that the absence of proper confrontation at trial “calls into question the ultimate ‘integrity of the fact-finding process.’ ” Chambers v. Mississippi, 410 U. S. 284, 295 (1973), quoting Berger v. California, 393 U. S. 314, 315 (1969).

The Court, however, has recognized that competing interests, if “closely examined,” Chambers v. Mississippi, 410 U. S., at 295, may warrant dispensing with confrontation at trial. See Mattox v. United States, 156 U. S., at 243 (“general rules of law of this kind, however beneficent in their operation and valuable to the accused, must occasionally give way to considerations of public policy and the necessities of the case”). Significantly, every jurisdiction has a strong interest in effective law enforcement, and in the development and precise formulation of the rules of evidence applicable in criminal proceedings. See Snyder v. Massachusetts, 291 U. S. 97, 107 (1934) ; California v. Green, 399 U. S., at 171-172 (concurring opinion).

This Court, in a series of cases, has sought to accommodate these competing interests. True to the common-law tradition, the process has been gradual, building on past decisions, drawing on new experience, and responding to changing conditions. The Court has not sought to “map out a theory of the Confrontation Clause that would determine the validity *65of all . . . hearsay ‘exceptions/ ” California v. Green, 399 U. S., at 162. But a general approach to the problem is discernible.

B

The Confrontation Clause operates in two separate ways to restrict the range of admissible hearsay. First, in conformance with the Framers’ preference for face-to-face accusation, the Sixth Amendment establishes a rule of necessity. In the usual case (including cases where prior cross-examination has occurred), the prosecution must either produce, or demonstrate the unavailability of, the declarant whose statement it wishes to use against the defendant. See Mancusi v. Stubbs, 408 U. S. 204 (1972); Barber v. Page, 390 U. S. 719 (1968). See also Motes v. United States, 178 U. S. 458 (1900); California v. Green, 399 U. S., at 161-162, 165, 167, n. 16.7

The second aspect operates once a witness is shown to be unavailable. Reflecting its underlying purpose to augment accuracy in the factfinding process by ensuring the defendant an effective means to test adverse evidence, the Clause countenances only hearsay marked with such trustworthiness that “there is no material departure from the reason of the general rule.” Snyder v. Massachusetts, 291 U. S., at 107. The principle recently was formulated in Mancusi v. Stubbs:

“The focus of the Court’s concern has been to insure that there ‘are indicia of reliability which have been widely viewed as determinative of whether a statement may be placed before the jury though there is no confrontation of the declarant,’ Dutton v. Evans, supra, at 89, and to ‘afford the trier of fact a satisfactory basis for evaluating *66the truth of the prior statement/ California v. Green, supra, at 161. It is clear from these statements, and from numerous prior decisions of this Court, that even though the witness be unavailable his prior testimony must bear some of these ‘indicia of reliability.’ ” 408 U. S., at 213.

The Court has applied this “indicia of reliability” requirement principally by concluding that certain hearsay exceptions rest upon such solid foundations that admission of virtually any evidence within them comports with the “substance of the constitutional protection.” Mattox v. United States, 156 U. S., at 244.8 This reflects the truism that “hearsay rules and the Confrontation Clause are generally designed to protect similar values,” California v. Green, 399 U. S., at 155, and “stem from the same roots,” Dutton v. Evans, 400 U. S. 74, 86 (1970). It also responds to the need for certainty in thé workaday world of conducting criminal trials.

In sum, when a hearsay declarant is not present for cross-examination at trial, the Confrontation Clause normally requires a showing that he is unavailable. Even then, his statement is admissible only if it bears adequate “indicia of reliability.” Reliability can be inferred without more in a case where the evidence falls within a -firmly rooted hearsay exception. In other cases, the evidence must be excluded, at least absent a showing of particularized guarantees of trustworthiness.9

*67III

We turn first to that aspect of confrontation analysis deemed dispositive by the Supreme Court of Ohio, and *68answered by it in the negative — whether Anita Isaacs’ prior testimony at the preliminary hearing bore sufficient “indicia of reliability.” Resolution of this issue requires a careful comparison of this case to California v. Green, supra.

A

In Green, at the preliminary hearing, a youth named Porter identified Green as a drug supplier. When called to the stand at Green’s trial, however, Porter professed a lapse of memory. Frustrated in its attempt to adduce live testimony, the prosecution offered Porter’s prior statements. The trial judge ruled the evidence admissible, and substantial portions of the preliminary hearing transcript were read to the jury. This Court found no error. Citing the established rule that prior trial testimony is admissible upon retrial if the declarant becomes unavailable, Mattox v. United States, 156 U. S. 237 (1895); Mancusi v. Stubbs, 408 U. S. 204 (1972), and recent dicta suggesting the admissibility of preliminary hearing testimony under proper circumstances, Barber v. Page, 390 U. S., at 725-*69726; Pointer v. Texas, 380 U. S., at 407, the Court rejected Green’s Confrontation Clause attack. It reasoned:

“Porter’s statement at the preliminary hearing had already been given under circumstances closely approximating those that surround the typical trial. Porter was under oath; respondent was represented by counsel — the same counsel in fact who later represented him at the trial; respondent had every opportunity to cross-examine Porter as to his statement; and the proceedings were conducted before a judicial tribunal, equipped to provide a judicial record of the hearings.” 399 U. S., at 165.

These factors, the Court concluded, provided all that the Sixth Amendment demands: “substantial compliance with the purposes behind the confrontation requirement.” Id., at 166.10

*70This passage and others in the Green opinion suggest that the opportunity to cross-examine at the preliminary hearing— even absent actual cross-examination — satisfies the Confrontation Clause. Yet the record showed, and the Court recognized, that defense counsel in fact had cross-examined Porter at the earlier proceeding. Id., at 151. Thus, Me. Justice Brennan, writing in dissent, could conclude only that “[p]erhaps” “the mere opportunity for face-to-face encounter [is] sufficient.” Id., at 200, n. 8. See Note, 52 Texas L. Rev. 1167, 1170 (1974).

We need not decide whether the Supreme Court of Ohio correctly dismissed statements in Green suggesting that the mere opportunity to cross-examine rendered the prior testimony admissible. See Westen, The Future of Confrontation, 77 Mich. L. Rev. 1185, 1211 (1979) (issue is “truly difficult to resolve under conventional theories of confrontation”). Nor need we decide whether de minimis questioning is sufficient, for defense counsel in this case tested Anita’s testimony with the equivalent of significant cross-examination.

B

Counsel’s questioning clearly partook of cross-examination as a matter of form. His presentation was replete with leading questions,11 the principal tool and hallmark of cross-*71examination. In addition, counsel’s questioning comported with the principal purpose of cross-examination: to challenge “whether the declarant was sincerely telling what he believed to be the truth, whether the declarant accurately perceived and remembered the matter he related, and whether the de-clarant’s intended meaning is adequately conveyed by the language he employed.” Davenport, The Confrontation Clause and the Co-Conspirator Exception in Criminal Prosecutions: A Functional Analysis, 85 Harv. L. Rev. 1378 (1972). Anita’s unwillingness to shift the blame away from respondent became discernible early in her testimony. Yet counsel continued to explore the underlying events in detail. He attempted, for example, to establish that Anita and respondent were sharing an apartment, an assertion that was critical to respondent’s defense at trial and that might have suggested ulterior personal reasons for unfairly casting blame on respondent. At another point, he directly challenged Anita’s veracity by seeking to have her admit that she had given the credit cards to respondent to obtain a television. When Anita denied this, defense counsel elicited the fact that the only television she owned was a “Twenty Dollar . . . old model.” App. 21. Cf. Davis v. Alaska, 415 U. S. 308, 316-317 (1974).

Respondent argues that, because defense counsel never asked the court to declare Anita hostile, his questioning necessarily occurred on direct examination. See State v. Minneker, 27 Ohio St. 2d 155, 271 N. E. 2d 821 (1971). But however state law might formally characterize the questioning of Anita, it afforded “substantial compliance with the purposes behind the confrontation requirement,” Green, 399 U. S., at 166, no less so than classic cross-examination. Although Ohio law may have authorized objection by the prosecutor or intervention by the court, this did not happen. As in Green, respondent’s counsel was not “significantly limited in any way in the scope or nature of his cross-examination.” Ibid.

*72We are also unpersuaded that Green is distinguishable on the ground that Anita Isaacs — unlike the declarant Porter in Green — was not personally available for questioning at trial. This argument ignores the language and logic of Green:

“Porter’s statement would, we think, have been admissible at trial even in Porter’s absence if Porter had been actually unavailable. . . . That being the case, we do not think a different result should follow where the witness is actually produced.” Id., at 165.

Nor does it matter that, unlike Green, respondent had a different lawyer at trial from the one at the preliminary hearing. Although one might strain one’s reading of Green to assign this factor some significance, respondent advances no reason of substance supporting the distinction. Indeed, if we were to accept this suggestion, Green would carry the seeds of its own demise; under a “same attorney” rule, a defendant could nullify the effect of Green by obtaining new counsel after the preliminary hearing was concluded.

Finally, we reject respondent’s attempt to fall back on general principles of confrontation, and his argument that this case falls among those in which the Court must undertake a particularized search for “indicia of reliability.” Under this theory, the factors previously cited — absence of face-to-face contact at trial, presence of a new attorney, and the lack of classic cross-examination — combine with considerations uniquely tied to Anita to mandate exclusion of her statements. Anita, respondent says, had every reason to lie to avoid prosecution or parental reprobation. Her unknown whereabouts is explicable as an effort to avoid punishment, perjury, or self-incrimination. Given these facts, her prior testimony falls on the unreliable side, and should have been excluded.

In making this argument, respondent in effect asks us to disassociate preliminary hearing testimony previously subjected to cross-examination from previously cross-examined *73prior-trial testimony, which the Court has deemed generally immune from subsequent confrontation attack. Precedent requires us to decline this invitation. In Green the Court found guarantees of trustworthiness in the accouterments of the preliminary hearing itself; there was no mention of the inherent reliability or unreliability of Porter and his story. See also Mancusi v. Stubbs, 408 U. S., at 216.

In sum, we perceive no reason to resolve the reliability issue differently here than the Court did in Green. “Since there was an adequate opportunity to cross-examine [the witness], and counsel . . . availed himself of that opportunity, the transcript . . . bore sufficient ‘indicia of reliability’ and afforded ‘ “the trier of fact a satisfactory basis for evaluating the truth of the prior statement.” ’ ” 408 U. S., at 216.12

*74IV

Our holding that the Supreme Court of Ohio erred in its “indicia of reliability” analysis does not fully dispose of the case, for respondent would defend the judgment on an alternative ground. The State, he contends, failed to lay a proper predicate for admission of the preliminary hearing transcript by its failure to demonstrate that Anita Isaacs was not available to testify in person at, the trial. All the justices of the Supreme Court of Ohio rejected this argument. 55 Ohio St. 2d, at 195 and 199, 378 N. E. 2d, at 495 and 497.

A

The basic litmus of Sixth Amendment unavailability is established: “[A] witness is not ‘unavailable’ for purposes of . . . the exception to the confrontation requirement unless the prosecutorial authorities have made a good-faith effort to obtain his presence at trial.” Barber v. Page, 390 U. S., at 724-725 (emphasis added). Accord, Mancusi v. Stubbs, supra; California v. Green, 399 U. S., at 161-162, 165, 167, n. 16; Berger v. California, 393 U. S. 314 (1969).

Although it might be said that the Court’s prior cases provide no further refinement of this statement of the rule, certain general propositions safely emerge. The law does not require the doing of a futile act. Thus, if no possibility of procuring the witness exists (as, for example, the witness’ intervening death), “good faith” demands nothing of the prosecution. But if there is a possibility, albeit remote, that affirmative measures might produce the declarant, the obligation of good faith may demand their effectuation. “The lengths to which the prosecution must go to produce a witness ... is a question of reasonableness.” California v. Green, 399 U. S., at 189, n. 22 (concurring opinion, citing Barber v. Page, supra). The ultimate question is whether the witness is unavailable despite good-faith efforts undertaken prior to trial to locate and present that witness. As with other evi-*75dentiary proponents, the prosecution bears the burden of establishing this predicate.

B

On the facts presented we hold that the trial court and the Supreme Court of Ohio correctly concluded that Anita's unavailability, in the constitutional sense, was established.

At the voir dire hearing, called for by the defense, it was shown that some four months prior to the trial the prosecutor was in touch with Amy Isaacs and discussed with her Anita’s whereabouts. It may appropriately be inferred that Mrs. Isaacs told the prosecutor essentially the same facts to which she testified at voir dire: that the Isaacs had last heard from Anita during the preceding summer; that she was not then in San Francisco, but was traveling outside Ohio; and that the Isaacs and their other children knew of no way to reach Anita even in an emergency. This last fact takes on added significance when it is recalled that Anita’s parents earlier had undertaken affirmative efforts to reach their daughter when the social worker’s inquiry came in from San Francisco. This is not a case of parents abandoning all interest in an absent daughter.

The evidence of record demonstrates that the prosecutor issued a subpoena to Anita at her parents’ home, not only once, but on five separate occasions over a period of several months. In addition, at the voir dire argument, the prosecutor stated to the court that respondent “witnessed that I have attempted to locate, I have subpoenaed, there has been a voir dire of the witness’ parents, and they have not been able to locate her for over a year.” App. 12.

Given these facts, the prosecution did not breach its duty of good-faith effort. To be sure, the prosecutor might have tried to locate by telephone the San Francisco social worker with whom Mrs. Isaacs had spoken many months before and might have undertaken other steps in an effort to find Anita. One, in hindsight, may always think of other things. Never*76theless, the great improbability that such efforts would have resulted in locating the witness, and would have led to her production at trial, neutralizes any intimation that a concept of reasonableness required their execution. We accept as a general rule, of course, the proposition that “the possibility of a refusal is not the equivalent of asking and receiving a rebuff.” Barber v. Page, 390 U. S., at 724, quoting from the dissenting opinion in that case in the Court of Appeals (381 F. 2d 479, 481 (CA10 1966)). But the service and ineffectiveness of the five subpoenas and the conversation with Anita's mother were far more than mere reluctance to face the possibility of a refusal. It was investigation at the last-known real address, and it was conversation with a parent who was concerned about her daughter’s whereabouts.

Barber and Mancusi v. Stubbs, supra, are the cases in which this Court has explored the issue of constitutional unavailability. Although each is factually distinguishable from this case, Mancusi provides significant support for a conclusion of good-faith effort here,13 and Barber has no contrary significance. Insofar as this record discloses no basis for concluding that Anita was abroad, the case is factually weaker than Mancusi; but it is stronger than Mancusi in the sense that the Ohio prosecutor, unlike the prosecutor in Mancusi, had no clear indication, if any at all, of Anita’s whereabouts. In Barber, the Court found an absence of good-faith effort where *77the prosecution made no attempt to secure the presence of a declarant incarcerated in a federal penitentiary in a neighboring State. There, the prosecution knew where the witness was, procedures existed whereby the witness could be brought to the trial, and the witness was not in a position to frustrate efforts to secure his production. Here, Anita’s whereabouts were not known, and there was no assurance that she would be found in a place from which she could be forced to return to Ohio.

We conclude that the prosecution carried its burden of demonstrating that Anita was constitutionally unavailable for purposes of respondent’s trial.

The judgment of the Supreme Court of Ohio is reversed, and the case is remanded for further proceedings not inconsistent with this opinion.

It is so ordered.