368
Opinion of the Court
search knows that the subject of his search is a parolee. We decline to adopt such an approach. We have never suggested that the exclusionary rule must apply in every circumstance in which it might provide marginal deterrence. United States v. Calandra, supra, at 350; Alderman v. United States, 394 U. S. 165, 174 (1969). Furthermore, such a piecemeal approach to the exclusionary rule would add an additional layer of collateral litigation regarding the officer's knowledge of the parolee's status.
In any event, any additional deterrence from the Pennsylvania Supreme Court's rule would be minimal. Where the person conducting the search is a police officer, the officer's focus is not upon ensuring compliance with parole conditions or obtaining evidence for introduction at administrative proceedings, but upon obtaining convictions of those who commit crimes. The noncriminal parole proceeding "falls outside the offending officer's zone of primary interest." Janis, supra, at 458. Thus, even when the officer knows that the subject of his search is a parolee, the officer will be deterred from violating Fourth Amendment rights by the application of the exclusionary rule to criminal trials.
Even when the officer performing the search is a parole officer, the deterrence benefits of the exclusionary rule remain limited. Parole agents, in contrast to police officers, are not "engaged in the often competitive enterprise of ferreting out crime," United States v. Leon, 468 U. S., at 914; instead, their primary concern is whether their parolees should remain free on parole. Thus, their relationship with parolees is more supervisory than adversarial. Griffin v. Wisconsin, 483 U. S. 868, 879 (1987). It is thus "unfair to assume that the parole officer bears hostility against the parolee that destroys his neutrality; realistically the failure of the parolee is in a sense a failure for his supervising officer." Morrissey v. Brewer, supra, at 485-486. Although this relationship does not prevent parole officers from ever violating the Fourth Amendment rights of their parolees, it does mean
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