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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 adjusted 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".



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