United States v. Karo

United States v. Karo is a Supreme Court case from 1984 that dealt with the legality of using a tracking device without a warrant. Law enforcement had placed a hidden transmitter in a can of ether, which was then used to monitor the defendant's movements. The Court ruled that this action violated the Fourth Amendment's protection against unreasonable searches. It determined that tracking someone’s movements using a device constitutes a search, and thus requires a warrant. This case clarified the privacy rights concerning surveillance and the need for law enforcement to obtain proper judicial authorization.