Mapp v. Ohio

Common card · No. 257428

Mapp v. Ohio, 367 U.S. 643 (1961), is 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, also applies to the states. The Supreme Court accomplished this by use of a principle known as selective incorporation. In Mapp, this involved the incorporation of the provisions, as interpreted by the Court, of the Fourth Amendment (which applies only to actions of the federal government) into the Fourteenth Amendment's Due Process Clause. On the matter of warrantless searches, the court cited Boyd v. United States and ruled, "It is not the breaking of his doors, and the rummaging of his drawers, that constitutes the essence of the offense; but it is the invasion of his indefeasible right of personal security, personal liberty, and private property."

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