The case through which Fourth Amendment protections were incorporated to the states was

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In Mapp v. Ohio, the Supreme Court ruled that evidence obtained through illegal search and seizure by state law enforcement officials could not be used in criminal trials in state courts. This decision incorporated the Fourth Amendment's protection against unreasonable searches and seizures to the states, and thus applied to all levels of law enforcement, including state and local officials.

The Case Through Which Fourth Amendment Protections Were Incorporated to the States