Summary

Irvine v. California — Opinion of the Court

No matter what an illegal raid turns up, police are unlikely to inform on themselves or each other. If it turns up nothing incriminating, the innocent victim usually does not care to take steps which will air the fact that he has been under suspicion. And the prospect that the guilty may capitalize on the official wrongdoing in his defense, or to obtain reversal from a higher court, removes any motive he might have to inform.
Source: Wikisource

Irvine v. California — Opinion of the Court

That the rule of exclusion and reversal results in the escape of guilty persons is more capable of demonstration than that it deters invasions of right by the police. The case is made, so far as the police are concerned, when they announce that they have arrested their man. Rejection of the evidence does nothing to punish the wrong-doing official, while it may, and likely will, release the wrong-doing defendant. It deprives society of its remedy against one lawbreaker because he has been pursued by another.
Source: Wikisource

Irvine v. California — Opinion of the Court

But to upset state convictions even before the states have had adequate opportunity to adopt or reject the rule would be an unwarranted use of federal power. The chief burden of administering criminal justice rests upon state courts. To impose upon them the hazard of federal reversal for noncompliance with standards as to which this Court and its members have been so inconstant and inconsistent would not be justified. We adhere to Wolf as stating the law of search-and-seizure cases and decline to introduce vague and subjective distinctions.
Source: Wikisource

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