Cite as: 524 U. S. 357 (1998)
Opinion of the Court
such litigation, such a change would transform those proceedings from a "predictive and discretionary" effort to promote the best interests of both parolees and society into trial-like proceedings "less attuned" to the interests of the parolee. Gagnon v. Scarpelli, supra, at 787-788 (quoting Morrissey v. Brewer, supra, at 480). We are simply unwilling so to intrude into the States' correctional schemes. See Morrissey v. Brewer, supra, at 483 (recognizing that States have an "overwhelming interest" in maintaining informal, administrative parole revocation procedures). Such a transformation ultimately might disadvantage parolees because in an adversarial proceeding, "the hearing body may be less tolerant of marginal deviant behavior and feel more pressure to reincarcerate than to continue nonpunitive rehabilitation." Gagnon v. Scarpelli, supra, at 788. And the financial costs of such a system could reduce the State's incentive to extend parole in the first place, as one of the purposes of parole is to reduce the costs of criminal punishment while maintaining a degree of supervision over the parolee.
The deterrence benefits of the exclusionary rule would not outweigh these costs. As the Supreme Court of Pennsylvania recognized, application of the exclusionary rule to parole revocation proceedings would have little deterrent effect upon an officer who is unaware that the subject of his search is a parolee. 548 Pa., at 431, 698 A. 2d, at 38. In that situation, the officer will likely be searching for evidence of criminal conduct with an eye toward the introduction of the evidence at a criminal trial. The likelihood that illegally obtained evidence will be excluded from trial provides deterrence against Fourth Amendment violations, and the remote possibility that the subject is a parolee and that the evidence may be admitted at a parole revocation proceeding surely has little, if any, effect on the officer's incentives. Cf. United States v. Janis, 428 U. S., at 448.
The Pennsylvania Supreme Court thus fashioned a special rule for those situations in which the officer performing the
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