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Mapp v. Ohio, 367 U.S. 643 (1961), was a landmark U.S. Supreme Court decision in which the Court ruled that the exclusionary rule, which prevents a prosecutor from using evidence that was obtained by violating the Fourth Amendment to the U.S. Constitution, applies to states as well as the federal government.
The exclusionary rule does not apply in a civil case, in a grand jury proceeding, or in a parole revocation hearing.. The law in force at the time of the police action, not the time of the attempt to introduce the evidence, controls whether the action is illegal for exclusionary rule purposes.
Arizona v. Evans, 514 U.S. 1 (1995), was a United States Supreme Court case in which the Court instituted an exclusionary rule exception allowing evidence obtained through a warrantless search to be valid when a police record erroneously indicates the existence of an outstanding warrant due to negligent conduct of a Clerk of Court.
The majority reviewed the history of the exclusionary rule established in early 20th-century cases such as Weeks v. United States (1914) and Gouled v. United States , (1921) and applied to state courts in Mapp v.
Terry's lawyer filed a motion to suppress the evidence of the discovered pistol, arguing McFadden's frisk had been a violation of Terry's Fourth Amendment rights and that the pistol should be excluded from evidence under the exclusionary rule. The trial judge denied his motion on the basis that the stop-and-frisk was generally presumed legal ...
Silverthorne Lumber Co. v. United States, 251 U.S. 385 (1920), was a U.S. Supreme Court decision in which Silverthorne had attempted to evade paying taxes. Federal agents illegally seized tax books from Silverthorne and created copies of the records.
Wolf v. Colorado, 338 U.S. 25 (1949), was a United States Supreme Court case in which the Court held 6—3 that, while the Fourth Amendment was applicable to the states, the exclusionary rule was not a necessary ingredient of the Fourth Amendment's right against warrantless and unreasonable searches and seizures.
United States (1914), [2] has been enforced by the exclusionary rule, which excludes most evidence gathered through Fourth Amendment violations from criminal trials. While Wolf v. Colorado (1949) [3] had held the amendment to apply to the states, a process known as incorporation, the exclusionary rule had explicitly not been incorporated by the ...