delivered the opinion of the Court.

In Michigan v. Jackson, 475 U. S. 625 (1986), the Court established a prophylactic rule that once a criminal defendant invokes his Sixth Amendment right to counsel, a subsequent waiver of that right — even if voluntary, knowing, and intelligent under traditional standards — is presumed invalid if secured pursuant to police-initiated conversation. We held that statements obtained in violation of that rule may not be admitted as substantive evidence in the prosecution’s case in chief. The question presented in this case is whether the *346prosecution may use a statement taken in violation of the Jackson prophylactic rule to impeach a defendant’s false or inconsistent testimony. We hold that it may do so.

Respondent Tyris Lemont Harvey was convicted of two counts of first-degree criminal sexual conduct in connection with the rape of Audrey Sharp on June 11, 1986. Harvey was taken into custody on July 2, 1986, and on that date, he made a statement to an investigating officer. He was arraigned later on July 2, and counsel was appointed for him. More than two months later, Harvey told another police officer that he wanted to make a second statement, but did not know whether he should talk to his lawyer. Although the entire context of the discussion is not clear from the record, the officer told respondent that he did not need to speak with his attorney, because “his lawyer was going to get a copy of the statement anyway.” App. 32-33 (stipulation of prosecution). Respondent then signed a constitutional rights waiver form, on which he initialed the portions advising him of his right to remain silent, his right to have a lawyer present before and during questioning, and his right to have a lawyer appointed for him prior to any questioning. App. to Pet. for Cert. 3a-4a.1 Asked whether he understood his constitutional rights, respondent answered affirmatively. He then gave a statement detailing his version of the events of June 11.

At a bench trial, Sharp testified that Harvey visited her home at 2:30 a.m. on the date in question and asked to use the telephone. After placing a call, Harvey confronted Sharp with a barbecue fork, and a struggle ensued. According to Sharp, respondent struck her in the face, threatened her with the fork and a pair of garden shears, and eventually threw her to the floor of her kitchen. When she ran to the living room to escape, Harvey pursued her with the weapons, *347demanded that she take off her clothes, and forced her to engage in sexual acts.

Harvey testified in his own defense and presented a conflicting account of the night’s events. He claimed that he had gone to Sharp’s home at 9 p.m. and invited her to smoke some crack cocaine, which he offered to supply in return for sexual favors. She agreed, but after smoking the cocaine, she refused to perform the favors. When respondent would not leave her house, Sharp allegedly grabbed the barbecue fork and threatened him, triggering a brief fight during which he grabbed the fork and threw it to the floor. The two then moved to the living room, where, according to Harvey, Sharp voluntarily removed her clothes. He testified, however, that the two never engaged in sexual intercourse and that he left shortly thereafter.

On cross-examination, the prosecutor used Harvey’s second statement to the police to impeach his testimony. Before doing so, the prosecutor stipulated that the statement “was not subject to proper Miranda,” App. 32, and therefore could not have been used in the case in chief. But because the statement was voluntary, the prosecutor argued that it could be used for impeachment under our decision in Harris v. New York, 401 U. S. 222 (1971). Defense counsel did not object, App. 34; App. to Pet. for Cert. 5a, and the trial court permitted the questioning. The prosecutor then impeached certain of Harvey’s statements, including his claim that he had thrown the barbecue fork to the floor, by showing that he had omitted that information from his statement to the police. App. 36-45.2 The trial judge believed the victim’s testimony and found respondent guilty as charged.

*348The Michigan Court of Appeals reversed the conviction. The court noted that if the second statement had been taken only in violation of the rules announced in Miranda v. Arizona, 384 U. S. 436 (1966), it could have been used to impeach Harvey’s testimony. It held, however, that the statement was inadmissible even for impeachment purposes, because it was taken “in violation of defendant’s Sixth Amendment right to counsel. See e. g., Michigan v. Jackson, 475 US 625.” App. to Pet. for Cert. 6a-7a. Because the trial “involved a credibility contest between defendant and the victim,” the court concluded that the impeachment was not harmless beyond a reasonable doubt. Id., at 7a. The Michigan Supreme Court denied leave to appeal, three justices dissenting, and we granted certiorari. 489 U. S. 1010 (1989). We now reverse.

To understand this case, it is necessary first to review briefly the Court’s jurisprudence surrounding the Sixth Amendment. The text of the Amendment provides in pertinent part that “[i]n all criminal prosecutions, the accused shall enjoy the right ... to have the Assistance of Counsel for his defence.” The essence of this right, we recognized in Powell v. Alabama, 287 U. S. 45 (1932), is the opportunity for a defendant to consult with an attorney and to have him investigate the case and prepare a defense for trial. Id., at 58, 71. More recently, in a line of cases beginning with Massiah v. United States, 377 U. S. 201 (1964), and extending through Maine v. Moulton, 474 U. S. 159 (1985), the Court has held that once formal criminal proceedings begin, the Sixth Amendment renders inadmissible in the prosecution’s case in chief statements “deliberately elicited” from a defendant without an express waiver of the right to counsel. See also United States v. Henry, 447 U. S. 264 (1980); Brewer v. Williams, 430 U. S. 387 (1977). For the fruits of postindictment interrogations to be admissible in a prosecution’s case in chief, the State must prove a voluntary, knowing, and intelligent relinquishment of the Sixth Amendment *349right to counsel. Patterson v. Illinois, 487 U. S. 285, 292, and n. 4 (1988); Brewer, supra, at 404. We have recently held that when a suspect waives his right to counsel after receiving warnings equivalent to those prescribed by Miranda v. Arizona, supra, that will generally suffice to establish a knowing and intelligent waiver of the Sixth Amendment right to counsel for purposes of postindictment questioning. Patterson v. Illinois, supra.

In Michigan v. Jackson, 475 U. S. 625 (1986), the Court created a bright-line rule for deciding whether an accused who has “asserted” his Sixth Amendment right to counsel has subsequently waived that right. Transposing the reasoning of Edwards v. Arizona, 451 U. S. 477 (1981), which had announced an identical “prophylactic rule” in the Fifth Amendment context, see Solem v. Stumes, 465 U. S. 638, 644 (1984), we decided that after a defendant requests assistance of counsel, any waiver of Sixth Amendment rights given in a discussion initiated by police is presumed invalid, and evidence obtained pursuant to such a waiver is inadmissible in the prosecution’s case in chief. Jackson, supra, at 636. Thus, to help guarantee that waivers are truly voluntary, Jackson established a presumption which renders invalid some waivers that would be considered voluntary, knowing, and intelligent under the traditional case-by-case inquiry called for by Brewer v. Williams.

There is no dispute in this case that respondent had a Sixth Amendment right to counsel at the time he gave the statement at issue. The State further concedes that the police transgressed the Jackson rule, because the colloquy between respondent and the investigating officer “cannot be viewed as defendant-initiated interrogation.” Tr. of Oral Arg. 52. The question, then, is whether a statement to police taken in violation of Jackson can be admitted to impeach a defendant’s inconsistent trial testimony.

Michigan v. Jackson is based on the Sixth Amendment, but its roots lie in this Court’s decisions in Miranda v. Ari*350zona, supra, and succeeding cases. Miranda, of course, required police interrogators to advise criminal suspects of their rights under the Fifth and Fourteenth Amendments and set forth a now-familiar set of suggested instructions for that purpose. Although recognizing that the Miranda rules would result in the exclusion of some voluntary and reliable statements, the Court imposed these “prophylactic standards” on the States, see Michigan v. Tucker, 417 U. S. 433, 446 (1974), to safeguard the Fifth Amendment privilege against self-incrimination. Edwards v. Arizona added a second layer of protection to the Miranda rules, holding that “when an accused has invoked his right to have counsel present during custodial interrogation, a valid waiver of that right cannot be established by showing only that he responded to further police-initiated custodial interrogation even if he has been advised of his rights.” 451 U. S., at 484. Edwards thus established another prophylactic rule designed to prevent police from badgering a defendant into waiving his previously asserted Miranda rights. See Oregon v. Bradshaw, 462 U. S. 1039, 1044 (1983) (plurality opinion).

Jackson simply superimposed the Fifth Amendment analysis of Edwards onto the Sixth Amendment. Reasoning that “the Sixth Amendment right to counsel at a postarraignment interrogation requires at least as much protection as the Fifth Amendment right to counsel at any custodial interrogation,” Jackson, supra, at 632, the Court in Jackson concluded that the Edwards protections should apply when a suspect charged with a crime requests counsel outside the context of interrogation. This rule, like Edwards, is based on the supposition that suspects who assert their right to counsel are unlikely to waive that right voluntarily in subsequent interrogations.

We have already decided that although statements taken in violation of only the prophylactic Miranda rules may not be used in the prosecution’s case in chief, they are admissible to impeach conflicting testimony by the defendant. Harris v. *351New York, 401 U. S. 222 (1971); Oregon v. Hass, 420 U. S. 714 (1975). The prosecution must not be allowed to build its case against a criminal defendant with evidence acquired in contravention of constitutional guarantees and their corresponding judicially created protections. But use of statements so obtained for impeachment purposes is a different matter. If a defendant exercises his right to testify on his own behalf, he assumes a reciprocal “obligation to speak truthfully and accurately,” Harris, 401 U. S., at 225, and we have consistently rejected arguments that would allow a defendant to “ ‘turn the illegal method by which evidence in the Government’s possession was obtained to his own advantage, and provide himself with a shield against contradiction of his untruths.’” Id., at 224 (quoting Walder v. United States, 347 U. S. 62, 65 (1954)). See also Hass, supra, at 722; United States v. Havens, 446 U. S. 620, 626 (1980).

There is no reason for a different result in a Jackson case, where the prophylactic rule is designed to ensure voluntary, knowing, and intelligent waivers of the Sixth Amendment right to counsel rather than the Fifth Amendment privilege against self-incrimination or “right to counsel.” We have mandated the exclusion of reliable and probative evidence for all purposes only when it is derived from involuntary statements. New Jersey v. Portash, 440 U. S. 450, 459 (1979) (compelled incriminating statements inadmissible for. impeachment purposes); Mincey v. Arizona, 437 U. S. 385, 398 (1978) (same). We have never prevented use by the prosecution of relevant voluntary statements by a defendant, particularly when the violations alleged by a defendant relate only to procedural safeguards that are “not themselves rights protected by the Constitution,” Tucker, supra, at 444 CMiranda rules), but are instead measures designed to ensure that constitutional rights are protected. In such cases, we have decided that the “search for truth in a criminal case” outweighs the “speculative possibility” that exclusion of evidence might deter future violations of rules not compelled di*352rectly by the Constitution in the first place. Hass, supra, at 722-723; Havens, supra, at 627 (reaffirming Hass). Hass was decided 15 years ago, and no new information has come to our attention which should lead us to think otherwise now.

Respondent argues that there should be a different exclusionary rule for Jackson violations than for transgressions of Edwards and Miranda. The distinction, he suggests, is that the adversarial process has commenced at the time of a Jackson violation, and the postarraignment interrogations thus implicate the constitutional guarantee of the Sixth Amendment itself. But nothing in the Sixth Amendment prevents a suspect charged with a crime and represented by counsel from voluntarily choosing, on his own, to speak with police in the absence of an attorney. We have already held that a defendant whose Sixth Amendment right to counsel has attached by virtue of an indictment may execute a knowing and intelligent waiver of that right in the course of a police-initiated interrogation. Patterson v. Illinois, 487 U. S. 285 (1988). To be sure, once a defendant obtains or even requests counsel as respondent had here, analysis of the waiver issue changes. But that change is due to the protective rule we created in Jackson based on the apparent inconsistency between a request fob counsel and a later voluntary decision to proceed without assistance. See 487 U. S., at 290, n. 3.; cf. Michigan v. Mosley, 423 U. S. 96, 110, n. 2 (1975) (White, J., concurring in result).

In other cases, we have explicitly declined to hold that a defendant who has obtained counsel cannot himself waive his right to counsel. See Brewer, 430 U. S., at 405-406 (“The Court of Appeals did not hold, nor do we, that under the circumstances of this case Williams could not, without notice to counsel, have waived his rights under the Sixth and Fourteenth Amendments. It only held, as do we, that he did not”) (emphasis in original); Estelle v. Smith, 451 U. S. 454, 471-472, n. 16 (1981) (“We do not hold that respondent was precluded from waiving this constitutional right [to coun*353sel]. ... No such waiver has been shown, or even alleged, here”). A defendant’s right to rely on counsel as a “medium” between the defendant and the State attaches upon the initiation of formal charges, Moulton, 474 U. S., at 176, and respondent’s contention that a defendant cannot execute a valid waiver of the right to counsel without first speaking to an attorney is foreclosed by our decision in Patterson. Moreover, respondent’s view would render the prophylactic rule adopted in Jackson wholly unnecessary, because even waivers given during defendant-initiated conversations would be per se involuntary or otherwise invalid, unless counsel were first notified.

Although a defendant may sometimes later regret his decision to speak with police, the Sixth Amendment does not disable a criminal defendant from exercising his free will. To hold that a defendant is inherently incapable of relinquishing his right to counsel once it is invoked would be “to imprison a man in his privileges and call it the Constitution.” Adams v. United States ex rel. McCann, 317 U. S. 269, 280 (1942). This we decline to do. Both Jackson and Edwards establish prophylactic rules that render some otherwise valid waivers of constitutional rights invalid when they result from police-initiated interrogation, and in neither case should “the shield provided by [the prophylactic rule] be perverted into a license to use perjury by way of a defense, free from the risk of confrontation with prior inconsistent utterances.” Harris, 401 U. S., at 226.

Respondent and amici assert, alternatively, that the conduct of the police officer who took Harvey’s second statement violated the “core value” of the Sixth Amendment’s constitutional guarantee, and under those circumstances, the second statement may not be used even for impeachment purposes. They contend that respondent was affirmatively misled as to his need for counsel, and his purported waiver is therefore invalid. But on the record before us, it is not possible to determine whether Harvey’s waiver was knowing and volun*354tary. The state courts developed no record on that issue, and the Michigan Court of Appeals did not rest its holding on any such determination. There was no testimony on this point before the trial court. The only statement in the trial record concerning the issue of waiver is the prosecutor’s concession that the second statement was taken in violation of respondent’s Miranda rights. But that concession is consistent with the Michigan Court of Appeals’ finding that the police violated Jackson, which is, after all, only a Sixth Amendment analogue to the Miranda and Edwards decisions. The Michigan court made no independent inquiry into whether there had been an otherwise valid waiver .of the right to counsel, and respondent’s counsel himself conceded that, putting aside the prosecutor’s concession, the record is insufficient to determine whether there was a voluntary waiver of Sixth Amendment rights. Tr. of Oral Arg. 31-32. In short, the issue was never litigated in this case.

Because respondent’s counsel did not object at trial to the use of his second statement for impeachment purposes, the State had no occasion to offer evidence to establish that Harvey gave a knowing and voluntary waiver of his right to counsel under traditional standards. On remand, the Michigan courts are free to conduct a hearing on that question. It is the State’s burden to show that a waiver is knowing and voluntary, Brewer v. Williams, supra, at 404, and if all the circumstances in a particular case show that the police have engaged in a course of conduct which would render the waiver involuntary, the burden will not be satisfied. Those facts are not before us, however, and we need not consider the admissibility for impeachment purposes of a voluntary statement obtained in the absence of a knowing and voluntary waiver of the right to counsel.

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

It is so ordered.

The question presented by this case, as I understand it, is whether the State may initiate a private interview with an indicted and represented defendant to obtain impeachment evidence for use at trial. The answer to that question should be plain: “The Sixth Amendment guarantees the accused, at least after the initiation of formal charges, the right to rely on counsel as a ‘medium’ between him and the State.” Maine v. Moulton, 474 U. S. 159, 176 (1985). This right to rely on counsel applies whether the State is seeking evidence for use in its case in chief, rebuttal evidence, information about trial strategy, or material for use as impeachment.

The Court, couching its conclusion in the language of “prophylactic-rules,” seemingly answers this question in the affirmative. It reasons as follows: Although Michigan v. Jackson, 475 U. S. 625 (1986), is based on the Sixth Amendment, it protects only Fifth Amendment values; the Fifth Amendment does not prohibit the introduction of statements taken after the accused has invoked his right to counsel for use as impeachment; therefore, the Sixth Amendment, as interpreted in Jackson, does not prohibit the use of evidence taken in violation of its strictures for impeachment at trial. The Court’s syllogism is flawed from the beginning. Only two Terms ago, we made clear that the constitutional rule recognized in Jackson is based on the Sixth Amendment interest in preserving “the integrity of an accused’s choice to communicate with police only through counsel.” Patterson v. Illinois, 487 U. S. 285, 291 (1988). The Court should acknowledge as much and hold that the Sixth Amendment is violated when the fruits of the State’s impermissible encounter with the represented defendant are used for impeachment just as it is when the fruits are used in the prosecutor’s case in chief.

*356I

To explain the error of the Court’s analysis, it is appropriate to start where the Court does with the difference between the Fifth and Sixth Amendments and the values each serves. The Fifth Amendment protects against compelled self-incrimination.1 It prevents a criminal defendant from being made “‘the deluded instrument of his own conviction.’” Culombe v. Connecticut, 367 U. S. 568, 581 (1961) (opinion of Frankfurter, J.) (quoting 2 W. Hawkins, Pleas of the Crown 595 (8th ed. 1824)). Our decisions in Miranda and its progeny primarily safeguard that right against “the compulsion inherent in custodial surroundings.” Miranda v. Arizona, 384 U. S. 436, 458 (1966). The initiation by the police of contact with an unrepresented defendant, after the invocation of the right to counsel during interrogation or at arraignment, creates an irrebuttable presumption that a defendant’s waiver of his privilege against compelled self-incrimination is not voluntary. See Edwards v. Arizona, 451 U. S. 477 (1981); Michigan v. Mosley, 423 U. S. 96, 110, n. 2 (1975) (White, J., concurring in result); see also ante, at 350. But when that compulsion has been dispelled by the suspect’s initiation of interrogation and voluntary waiver of his rights, there is no remaining Fifth Amendment objection to introduction at trial of a statement made outside the presence of counsel. See, e. g., Oregon v. Bradshaw, 462 U. S. 1039 (1983).

The Sixth Amendment right to counsel2 is much more pervasive because it affects the ability of the accused to assert any other rights he might have.3 It is indisputable that the *357Amendment assures “ ‘Assistance’ at trial, when the accused [is] confronted with both the intricacies of the law and the advocacy of the public prosecutor.” United States v. Ash, 413 U. S. 300, 309 (1973); see also Perry v. Leeke, 488 U. S. 272, 279 (1989); United States v. Cronic, 466 U. S. 648, 659, n. 25 (1984). That guarantee applies equally whether the defendant is presenting his case or the State is rebutting or impeaching the defendant’s evidence. The State’s interest in truthseeking is congruent with the defendant’s interest in representation by counsel, for it is an elementary premise of our system of criminal justice “‘that partisan advocacy on both sides of a case will best promote the ultimate objective that the guilty be convicted and the innocent go free.’” Cronic, 466 U. S., at 655 (quoting Herring v. New York, 422 U. S. 853, 862 (1975)); see also Penson v. Ohio, 488 U. S. 75, 84 (1988).

The accused’s right to the assistance of counsel is not limited to participation in the trial itself. A defendant is entitled to the aid of his lawyer from the time of arraignment “when consultation, thoroughgoing investigation and preparation [are] vitally important,” Powell v. Alabama, 287 U. S. 45, 57 (1932), through the time of first appeal. See Penson, 488 U. S., at 85; Anders v. California, 386 U. S. 738 (1967); Douglas v. California, 372 U. S. 353 (1963). Just as the Sixth Amendment’s right to “the Assistance” of counsel necessarily encompasses a right to the effective assistance of counsel, see Cronic, 466 U. S., at 654-655; Avery v. Alabama, 308 U. S. 444, 446 (1940), so too the accused’s right to have counsel “for his defence” in a “criminal prosecutio[n]” in-*358eludes the right to rely on counsel after the government’s role has shifted from investigation to accusation and the “defendant finds himself faced with the prosecutorial forces of organized society.” Kirby v. Illinois, 406 U. S. 682, 689 (1972) (opinion of Stewart, J.); see also Moran v. Burbine, 475 U. S. 412, 430 (1986).4 Any lesser guarantee would provide insufficient protection against any attempt by the State to supplant “the public trial guaranteed by the Bill of Rights” with a “secret trial in the police precincts.” Spano v. New York, 360 U. S. 315, 326 (1959) (Douglas, J., concurring).5

*359The Court correctly explains that Jackson was based in part on Fifth Amendment concerns extending “the Edwards protections” to the situation “when a suspect charged with a crime requests counsel outside the context of interrogation.” Ante, at 350. However, that was not the whole of our opinion. Jackson is also firmly and explicitly rooted in our Sixth Amendment decisions holding that an indicted defendant has the “right to rely on counsel as a ‘medium’ between him and the State” whenever the State attempts to deliberately elicit information from him. See Maine v. Moulton, 474 U. S., at 176; Brewer v. Williams, 430 U. S. 387 (1977); United States v. Henry, 447 U. S. 264 (1980); Massiah v. United States, 377 U. S. 201 (1964). Jackson made clear that that right applied to the State’s initial question whether the defendant would like to waive his constitutional rights as well as to any subsequent questions asking for particular incriminating information. 475 U. S., at 632.6 The defendant may waive the right to be free from direct state communication by initiating contact with the State. But if the State initiates communication with a represented defendant outside the presence of counsel any subsequent waiver of the right to rely on counsel is not just “presumed invalid,” ante, at 349; it “is invalid.” Jackson, 475 U. S., at 636 (emphasis added). Preventing the State from directly contacting a represented defendant thus does not, as the Court states, “‘imprison a man in his privileges,”’ ante, at 353 (quoting Adams v. United States ex rel. McCann, 317 U. S. 269, 280 (1942)); it simply recognizes and gives respect to the defendant’s previously invoked choice to communicate with the State only through counsel. As Justice White explained for the *360Court in Patterson v. Illinois, while “an accused [can make] an initial election as to whether he will face the State’s officers during questioning with the aid of counsel, or go it alone,” “the essence” of Jackson and our earlier decision in Edwards v. Arizona, 451 U. S. 477 (1981), is “[preserving the integrity of an accused’s choice to communicate with the police only through counsel.” 487 U. S., at 291. Indeed, we expressly noted, in explaining why an unrepresented defendant could waive his Sixth Amendment rights without counsel being present, that “[o]nce an accused has a lawyer, a distinct set of constitutional safeguards aimed at preserving the sanctity of the attorney-client relationship takes effect.” Id., at 290, n. 3.

The right to consult with counsel prior to the commencement of an interrogation, moreover, cannot be limited to those interrogations that produce evidence for use in the State’s case in chief. The interests of the defendant in the assistance of counsel in his confrontation with the prosecutorial forces of organized society extend to all efforts to elicit information from the defendant whether for use as impeachment or rebuttal at trial or simply to formulate trial strategy. Cf. Weatherford v. Bursey, 429 U. S. 545, 552, 554 (1977); Wyrick v. Fields, 459 U. S. 42, 54 (1982) (Marshall, J., dissenting). Under Estelle v. Smith, 451 U. S. 454, 469-471 (1981), for example, psychiatric evidence taken from a represented defendant without notice to counsel may not be introduced at the sentencing phase of a capital trial even when, under Fifth Amendment standards, the evidence is otherwise admissible. See Powell v. Texas, 492 U. S. 680, 681 (1989). Whether or not the accused has a right to have counsel present during a psychiatric examination, it is clear that there is a Sixth Amendment right to consult with counsel prior to submitting to the examination. 451 U. S., at 471; see also Satterwhite v. Texas, 486 U. S. 249, 254 (1988). Those concerns are not limited to the capital sentencing context. In Buchanan v. Kentucky, 483 U. S. 402 (1987), the Court unan*361imously agreed that Estelle was applicable to the use of psychiatric evidence as rebuttal during the guilt stage of a noncapital trial, holding that before the State initiates a psychiatric examination of a defendant, defense counsel must be informed “about the scope and nature of the proceeding.” 483 U. S., at 424; see also id., at 425, n. 21; id., at 433-434 (Marshall, J., dissenting). After the right to counsel has been implemented, the State may not short-circuit the adversarial system by confronting the defendant behind counsel’s back. In this case, there should be no equivocation about the conclusion that the State violated the Sixth Amendment when it initiated a private interview with respondent outside the presence of counsel and used the products of the interview as impeachment at trial.

II

Instead of acknowledging that the facts describe a plain violation of respondent’s Sixth Amendment right, the Court elides the issue by recharacterizing it as involving nothing more than the violation of a “prophylactic” rule. The purpose of this recharacterization is to enable the Court to draw an analogy to cases like Walder v. United States, 347 U. S. 62, 65 (1954), Harris v. New York, 401 U. S. 222 (1971), Oregon v. Hass, 420 U. S. 714 (1975), and United States v. Havens, 446 U. S. 620, 626 (1980), in which the Court held that the interests in deterring violations of Miranda and the Fourth Amendment were adequately served by excluding the illegally obtained evidence from the prosecutor’s case in chief. The Court’s analysis, however, simply ignores the reasons why evidence that is taken from an indicted defendant outside the presence of counsel is excluded from trial.

The Court has held that evidence seized in violation of the Fourth Amendment is excluded from a criminal trial not as a personal right of the criminal defendant but rather as a remedy for a wrong that is fully accomplished at the time the evidence is obtained. See, e. g., Stone v. Powell, 428 U. S. 465, 486 (1976); United States v. Calandra, 414 U. S. 338, *362348 (1974). Thus it is that evidence that is the product of an unreasonable search or seizure may nonetheless be introduced for impeachment purposes. Since its introduction causes no independent constitutional harm, the Court has reasoned that use of illegally obtained evidence for impeachment is not objectionable as long as the general efficacy of the exclusionary rule in deterring future violations of the Fourth Amendment is not thereby impaired. See Havens, 446 U. S., at 627-628.

A similar approach has characterized the Court’s analysis of introduction of statements taken in violation of a defendant’s rights under Miranda v. Arizona, 384 U. S. 436 (1966). The Court has held that Miranda establishes a prophylactic rule that “sweeps more broadly than the Fifth Amendment itself.” Oregon v. Elstad, 470 U. S. 298, 306 (1985); see New York v. Quarles, 467 U. S. 649, 654 (1984); Michigan v. Tucker, 417 U. S. 433, 444 (1974). Unwarned statements or statements improperly taken after the invocation of the right to counsel or the right to remain silent, such as respondent’s statement here, must be excluded from the State’s case in chief to ensure compliance with Miranda’s dictates. But as long as the statement is not unconstitutionally coerced or involuntary, see New Jersey v. Portash, 440 U. S. 450 (1979); Mincey v. Arizona, 437 U. S. 385, 398 (1978), and its limited use would not eviscerate the deterrent effect of the exclusionary rule, the Court has held that it can be admitted for impeachment purposes. See Oregon v. Hass, 420 U. S. 714 (1975); Harris v. New York, 401 U. S. 222 (1971).

The same is not so with respect to the Sixth Amendment. The exclusion of statements made by a represented and indicted defendant outside the presence of counsel follows not as a remedy for a violation that has preceded trial but as a necessary incident of the constitutional right itself.7 *363“[T]he Sixth Amendment right to counsel exists, and is needed, in order to protect the fundamental right to a fair trial.” Strickland v. Washington, 466 U. S. 668, 684 (1984). It is not implicated, as a general matter, in the absence of some effect of the challenged conduct on the trial process itself. See United States v. Cronic, 466 U. S., at 658; Weatherford v. Bursey, 429 U. S., at 558; see also Nix v. Williams, 467 U. S. 431, 456 (1984) (Stevens, J., concurring in judgment). It is thus the use of the evidence for trial, not the method of its collection prior to trial, that is the gravamen of the Sixth Amendment claim. Although the defendant may not be entitled to a remedy in the form of reversal of the conviction if the evidence is harmless, that conclusion does not alter the fact that admission of the evidence is itself error. As we explained in Massiah, even when police investigation of a defendant may be “entirely proper,” a defendant is “denied the basic protections of [the Sixth Amendment] guarantee when there [is] used against him at his trial evidence of his own incriminating words, which federal agents . . . deliberately elicited from him after he had been indicted and in the absence of his counsel.” 377 U. S., at 206-207. See also Maine v. Moulton, 474 U. S., at 178-180. There is no reason why that rule should not apply here.

*364The Court contents itself with the statement, drawn from Oregon v. Hass, supra, that there is only a “speculative possibility” that the State would be deterred from conducting a private interview with a represented defendant by a rule that excludes its product from use as impeachment at trial. Ante, at 351-352. Aside from the fact that the Court’s assurance will provide scant comfort to the defendant, such as respondent, whose statement is admitted at trial, it is perfectly clear that the balance struck in Hass would not prevent the unlawful police and prosecutorial conduct here. The police misconduct in Walder, Harris, Havens, and Hass all occurred before the defendant had been formally’charged, when the unsolved crime was still being investigated and the questioning of a suspect might be expected to produce evidence that is necessary to obtain an indictment. Knowledge that the improper conduct of an interrogation will destroy its use as substantive evidence provides a powerful incentive to follow the dictates of Miranda and its progeny with great care.

. Once a defendant is formally charged with an offense, however, the State is no longer merely engaged in the task of determining who committed an unsolved crime; rather, it is preparing to convict the defendant of the crime he allegedly committed. “[T]he government’s role shifts from investigation to accusation.” Moran v. Burbine, 475 U. S., at 430. The State has obtained sufficient evidence to establish probable cause, see Patterson v. Illinois, 487 U. S., at 306 (Stevens, J., dissenting), and the ethical prosecutor has sufficient admissible evidence to convict.8 In practice, the in*365vestigation is often virtually complete.9 Any subsequent investigation is a form of discovery.10 The cost of an illegal interrogation is therefore greatly reduced. The police would have everything to gain and nothing to lose by repeatedly visiting with the defendant and seeking to elicit as many comments as possible about the pending trial. Knowledge that such conversations could not be used affirmatively would not detract from the State’s interest in obtaining them for their value as impeachment evidence.11

Ill

In my dissenting opinion in Patterson v. Illinois, 487 U. S., at 301-302, I expressed my concern about the Court’s condonation of unethical forms of trial preparation.12 I un*366successfully argued that private interviews with a defendant conducted by the prosecutor for the purpose of obtaining evidence to be used against him at trial were so manifestly unfair that the practice should be flatly prohibited at any time after formal proceedings begin and the Sixth Amendment right attaches. The Court rejected my argument and held that a properly advised defendant whose right to counsel has not been implemented can validly waive his right to counsel after Miranda warnings have been administered. In explaining that holding, the Court recognized that the waiver issue cannot be resolved without “asking what purposes a lawyer can serve at the particular stage of the proceedings in question, and what assistance he could provide to an accused at that stage.” 487 U. S., at 298. The Court identified the *367constitutional right as a “spectrum” with minimal protection at one extreme and the maximum at the other.

“At the other extreme, recognizing the enormous importance and role that an attorney plays at a criminal trial, we have imposed the most rigorous restrictions on the information that must be conveyed to a defendant, and the procedures that must be observed, before permitting him to waive his right to counsel at trial. See Faretta v. California, 422 U. S. 806, 835-836 (1975); cf. Von Moltke v. Gillies, 332 U. S. 708, 723-724 (1948). In these extreme cases, and in others that fall between these two poles, we have defined the scope of the right to counsel by a pragmatic assessment of the usefulness of counsel to the accused at the particular proceeding, and the dangers to the accused of proceeding without counsel.” Ibid.

In this case the Court has nothing to say about the point on this spectrum at which the interview with respondent took place and the standards that would be sufficient to establish a waiver of the Sixth Amendment right. At the outset, the Court seems to hold that impeachment is always permissible,13 but in the end, after acknowledging that analysis of the waiver issue changes when a defendant obtains or requests counsel, ante, at 352, the Court simply asserts that the defendant must make “a knowing and voluntary waiver of the right to counsel.” Ante, at 354.14 The interview at issue in this case occurred after the right to counsel had been implemented, when respondent had been in custody for over two months and was to be tried in only a few days. Although the *368interview was conducted by a police officer rather than a lawyer, it was in many respects comparable to a pretrial deposition. The value of representation by counsel is evident. If respondent had been properly advised by counsel in preparation for such a deposition, he would have reviewed all of the facts he intended to describe in his trial testimony and been counseled not to omit any significant details, including presumably the three whose omission the State made use of as impeachment here.15 Interrogation outside the presence of counsel at this advanced stage of the proceedings can impair counsel’s representation of his client and interfere with trial strategy.

Regardless of whether or not the Court is prepared to accept a finding that respondent’s participation in such a pretrial deposition was “voluntary” — as measured by some undisclosed standard — it surely denigrates the value of the constitutional interest in the assistance of counsel to condone such a shabby practice.

IV

Apparently as a means of identifying rules that it disfavors, the Court repeatedly uses the term “prophylactic rule.” See ante, at 345, 349, 350, 351, and 353. It is important to remember, however, that all rules of law are prophy*369lactic. Speed limits are an example; they are designed to prevent accidents. The Sixth Amendment is another; it is designed to prevent unfair trials. An argument that a rule of law may be ignored, avoided, or manipulated simply because it is “prophylactic” is nothing more than an argument against the rule of law itself. The tragedy of today’s decision is not merely its denigration of the constitutional right at stake; it also undermines the principle that those who are entrusted with the power of government have the same duty to respect and obey the law as the ordinary citizen.

I respectfully dissent.