Cite as: 524 U. S. 357 (1998)
Opinion of the Court
(White, J., dissenting)). The exclusionary rule is instead a judicially created means of deterring illegal searches and seizures. United States v. Calandra, 414 U. S. 338, 348 (1974). As such, the rule does not "proscribe the introduction of illegally seized evidence in all proceedings or against all persons," Stone v. Powell, supra, at 486, but applies only in contexts "where its remedial objectives are thought most efficaciously served," United States v. Calandra, supra, at 348; see also United States v. Janis, 428 U. S. 433, 454 (1976) ("If . . . the exclusionary rule does not result in appreciable deterrence, then, clearly, its use in the instant situation is unwarranted"). Moreover, because the rule is prudential rather than constitutionally mandated, we have held it to be applicable only where its deterrence benefits outweigh its "substantial social costs." United States v. Leon, 468 U. S., at 907.
Recognizing these costs, we have repeatedly declined to extend the exclusionary rule to proceedings other than criminal trials. Id., at 909; United States v. Janis, supra, at 447. For example, in United States v. Calandra, we held that the exclusionary rule does not apply to grand jury proceedings; in so doing, we emphasized that such proceedings play a special role in the law enforcement process and that the traditionally flexible, nonadversarial nature of those proceedings would be jeopardized by application of the rule. 414 U. S., at 343-346, 349-350. Likewise, in United States v. Janis, we held that the exclusionary rule did not bar the introduction of unconstitutionally obtained evidence in a civil tax proceeding because the costs of excluding relevant and reliable evidence would outweigh the marginal deterrence benefits, which, we noted, would be minimal because the use of the exclusionary rule in criminal trials already deterred illegal searches. 428 U. S., at 448, 454. Finally, in INS v. Lopez-Mendoza, 468 U. S. 1032 (1984), we refused to extend the exclusionary rule to civil deportation proceedings, citing the high social costs of allowing an immigrant to remain illegally
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