Mapp v. Ohio (1961)

Cleveland police, without a warrant, raided Ms. Mapp's home and found obscene material even though the Fourth Amendment, as incorporated by the Fourteenth Amendment's "due process clause," protected her from improper law enforcement procedures. The Supreme Court extended the "exclusionary rule" to citizens in State courts, stating that condemning unreasonable searches would be useless unless the evidence obtained in these searches was excluded.