Mapp V. Ohio

Admitting evidence gained by illegal searches was permitted by some state constitutions before Mapp. Cleveland police raided Dollre Mapp's home without a warrant and found obscene materials. She appealed her conviction, saying that the 4th and 14th Amendments protected her rights against improper police behavior. Court agreed.

Court agreed, extending " exclusionary rule" protections to citizens in state courts, saying that the prohibition against unreasonable searches would be "meaningless" unless evidence gained in such searches was "excluded."

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