Summary

Portrait of Tom C. Clark Tom C. Clark Linkletter v. Walker — Opinion of the Court

The date of the seizure in Mapp has no legal significance. It was the judgment of this Court that changed the rule and the date of that opinion is the crucial date. In the light of the cases of this Court this is the better cutoff time. See United States v. Schooner Peggy, supra.
All that we decide today is that though the error complained of might be fundamental it is not of the nature requiring us to overturn all final convictions based upon it. After full consideration of all the factors we are not able to say that the Mapp rule requires retrospective application.
Source: Wikisource

Portrait of Tom C. Clark Tom C. Clark Linkletter v. Walker — Opinion of the Court

Mapp had as its prime purpose the enforcement of the Fourth Amendment through the inclusion of the exclusionary rule within its rights. This, it was found, was the only effective deterrent to lawless police action. Indeed, all of the cases since Wolf requiring the exclusion of illegal evidence have been based on the necessity for an effective deterrent to illegal police action. See, e.g., Rea v. United States, supra. We cannot say that this purpose would be advanced by making the rule retrospective.
Source: Wikisource

Portrait of Tom C. Clark Tom C. Clark Linkletter v. Walker — Opinion of the Court

But if subsequent to the judgment and before the decision of the appellate court, a law intervenes and positively changes the rule which governs, the law must be obeyed, or its obligation denied * * * (and) where individual rights * * * are sacrificed for national purposes * * * the court must decide according to existing laws, and if it be necessary to set aside a judgment * * * which cannot be affirmed but in violation of law, the judgment must be set aside.' At 110.
Source: Wikisource

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