Under our precedents, once the adversaryjudicial process has been initiated, the Sixth Amendment guarantees a defendant the right to have counsel present at all “critical” stages of the criminal proceedings. United States v. Wade, 388 U. S. 218, 227–228 (1967); Powell v. Alabama, 287 U. S. 45, 57 (1932). Interrogation by the State is such a stage. Massiah v. United States, 377 U. S. 201, 204–205 (1964); see also United States v. Henry, 447
U. S. 264, 274 (1980).
Our precedents also place beyond doubt that the SixthAmendment right to counsel may be waived by a defen-dant, so long as relinquishment of the right is voluntary,knowing, and intelligent. Patterson v. Illinois, 487 U. S. 285, 292, n. 4 (1988); Brewer v. Williams, 430 U. S. 387, 404 (1977); Johnson v. Zerbst, 304 U. S. 458, 464 (1938).The defendant may waive the right whether or not he isalready represented by counsel; the decision to waive neednot itself be counseled. Michigan v. Harvey, 494 U. S. 344, 352–353 (1990). And when a defendant is read his Miranda rights (which include the right to have counsel present during interrogation) and agrees to waive thoserights, that typically does the trick, even though the Miranda rights purportedly have their source in the Fifth Amendment:
“As a general matter . . . an accused who is admon-ished with the warnings prescribed by this Court in Miranda . . . has been sufficiently apprised of the na-ture of his Sixth Amendment rights, and of the conse-quences of abandoning those rights, so that his waiver on this basis will be considered a knowing and intelli-gent one.” Patterson, supra, at 296.
The only question raised by this case, and the only one addressed by the Jackson rule, is whether courts must presume that such a waiver is invalid under certain cir-cumstances. 475 U. S., at 630, 633. We created such a presumption in Jackson by analogy to a similar prophylac-tic rule established to protect the Fifth Amendment based Miranda right to have counsel present at any custodial interrogation. Edwards v. Arizona, 451 U. S. 477 (1981), decided that once “an accused has invoked his right to have counsel present during custodial interrogation . . . [he] is not subject to further interrogation by the authori-ties until counsel has been made available,” unless he initiates the contact. Id., at 484–485.
The Edwards rule is “designed to prevent police from badgering a defendant into waiving his previously as-serted Miranda rights,” Harvey, supra, at 350. It does this by presuming his postassertion statements to be involun-tary, “even where the suspect executes a waiver and his statements would be considered voluntary under tradi-tional standards.” McNeil v. Wisconsin, 501 U. S. 171, 177 (1991). This prophylactic rule thus “protect[s] a suspect’svoluntary choice not to speak outside his lawyer’s pres-ence.” Texas v. Cobb, 532 U. S. 162, 175 (2001) (KENNEDY, J., concurring).
Jackson represented a “wholesale importation of the Edwards rule into the Sixth Amendment.” Cobb, supra, at
175. The Jackson Court decided that a request for counsel at an arraignment should be treated as an invocation of the Sixth Amendment right to counsel “at every critical stage of the prosecution,” 475 U. S., at 633, despite doubt that defendants “actually inten[d] their request for counsel to encompass representation during any further question-ing,” id., at 632–633, because doubts must be “resolved in favor of protecting the constitutional claim,” id., at 633. Citing Edwards, the Court held that any subsequentwaiver would thus be “insufficient to justify police-initiated interrogation.” 475 U. S., at 635. In other words, we presume such waivers involuntary “based on the sup-position that suspects who assert their right to counsel are unlikely to waive that right voluntarily” in subsequent interactions with police. Harvey, supra, at 350.