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Any rule that excludes or suppresses evidence. A judge made rule that enforces the Constitutional guarantee of the Fourth Amendment.

The Fourth Amendment protects “[t]he right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures,” but “contains no provision expressly precluding the use of evidence obtained in violation of its commands,” Arizona v. Evans, 514 U. S. 1, 10 (1995). Nonetheless, decisions establish an exclusionary rule that, when applicable, forbids the use of improperly obtained evidence at trial. See, e.g., Weeks v. United States, 232 U. S. 383, 398 (1914). This judicially created rule is “designed to safeguard Fourth Amendment rights generally through its deterrent effect.” United States v. Calandra, 414 U. S. 338, 348 (1974). 

The Fourth Amendment contains no provision expressly precluding the use of evidence obtained in violation of its commands, and an examination of its origin and purposes makes clear that the use of fruits of a past unlawful search or seizure 'work[s] no new Fourth Amendment wrong.' United States v. Calandra, 414 U.S. 338, 354 (1974). The wrong condemned by the Amendment is fully accomplished' by the unlawful ...

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