<Table> <Tr> <Td> </Td> <Td> Wikisource has original text related to this article: Katz v. United States </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> Wikisource has original text related to this article: Katz v. United States </Td> </Tr> <P> Katz v. United States, 389 U.S. 347 (1967), is a United States Supreme Court case discussing the nature of the "right to privacy" and the legal definition of a "search". The Court's ruling refined previous interpretations of the unreasonable search and seizure clause of the Fourth Amendment to count immaterial intrusion with technology as a search, overruling Olmstead v. United States and Goldman v. United States . Katz also extended Fourth Amendment protection to all areas where a person has a "reasonable expectation of privacy". Katz v. United States can often be attributed to the formation and use of the Katz Test in other court cases . The Katz Test has two parts: the first is that the plaintiff displayed an expectation of privacy, and the second is that this expectation is "reasonable". </P> <P> Charles Katz used a public pay phone booth to transmit illegal gambling wagers from Los Angeles to Miami and Boston . Unbeknownst to Katz, the FBI was recording his conversations via an electronic eavesdropping device attached to the exterior of the phone booth . Katz was convicted based on these recordings . He challenged his conviction, arguing that the recordings were obtained in violation of his Fourth Amendment rights . The Court of Appeals sided with the FBI because there was no physical intrusion into the phone booth itself . </P>

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