Katz v. United States, 389 U.S. 347 (1967), was a landmark decision of the U.S. Supreme Court in which the Court redefined what constitutes a "search" or "seizure" with regard to the protections of the Fourth Amendment to the U.S. Constitution. The decision expanded the Fourth Amendment's protections from the right of search and seizures of an individual's "persons, houses, papers, and effects", as specified in the U.S. Constitution, to include as a constitutionally protected area "what [a person] seeks to preserve as private, even in an area accessible to the public".