The case that established the Exclusionary Rule on the state level was

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Mapp v. Ohio established the Exclusionary Rule on the state level, which prohibits the use of illegally obtained evidence in court. The case involved the police conducting an illegal search of Dollree Mapp's home and her subsequent conviction based on the illegally obtained evidence. The Supreme Court ruled that the Fourth Amendment's protection against unreasonable searches and seizures applies to states through the Due Process Clause of the Fourteenth Amendment, and therefore the illegally obtained evidence could not be used against Mapp in court.

The Case That Established the Exclusionary Rule on the State