where the exigencies of the situation require such an application.” 381 U. S., at 628; 382 U. S., at 410. These cases also delineate criteria by which such an issue may be resolved. We must look to the purpose of our new standards governing police interrogation, the reliance which may have been placed upon prior decisions on the subject, and the effect on the administration of justice of a retroactive application of Escobedo and Miranda. See 381 U. S., at 636; 382 U. S., at 413.
In Linkletter we declined to apply retroactively the rule laid down in Mapp v. Ohio, 367 U. S. 643 (1961), by which evidence obtained through an unreasonable search and seizure was excluded from state criminal proceedings. In so holding, we relied in part on the fact that the rule affected evidence “the reliability and relevancy of which is not questioned.” 381 U. S., at 639. Likewise in Tehan we declined to give retroactive effect to Griffin v. California, 380 U. S. 609 (1965), which forbade prosecutors and judges to comment adversely on the failure of a defendant to testify in a state criminal trial. In reaching this result, we noted that the basic purpose of the rule was to discourage courts from penalizing use of the privilege against self-incrimination. 382 U. S., at 414.
As Linkletter and Tehan acknowledged, however, we have given retroactive effect to other constitutional rules of criminal procedure laid down in recent years, where different guarantees were involved. For example, in Gideon v. Wainwright, 372 U. S. 335 (1963), which concerned the right of an indigent to the advice of counsel at trial, we reviewed a denial of habeas corpus. Similarly, Jackson v. Denno, 378 U. S. 368 (1964), which involved the right of an accused to effective exclusion of an involuntary confession from trial, was itself a collateral attack. In each instance we concluded that retroactive application was justified because the rule affected