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A "search" occurs for purposes of the Fourth Amendment when the Government violates a person's "reasonable expectation of privacy". [3] In Katz v. United States , 389 U.S. 347 (1967) Justice Harlan issued a concurring opinion articulating the two-prong test later adopted by the U.S. Supreme Court as the test for determining whether a police or ...
Maryland, [6] which dealt with the privacy of telephone records, established the concept of a third-party doctrine that has been used by the courts to determine to what extent Fourth Amendment protection expectation of privacy covers. This doctrine generally finds that information that a person provides voluntarily to a third-party no longer is ...
The Bill of Rights in the National Archives. The Fourth Amendment (Amendment IV) to the United States Constitution is part of the Bill of Rights.It prohibits unreasonable searches and seizures and sets requirements for issuing warrants: warrants must be issued by a judge or magistrate, justified by probable cause, supported by oath or affirmation, and must particularly describe the place to be ...
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 Fourth Amendment to the U.S. Constitution.
Smith v. Maryland, 442 U.S. 735 (1979), was a Supreme Court case holding that the installation and use of a pen register by the police to obtain information on a suspect's telephone calls was not a "search" within the meaning of the Fourth Amendment to the United States Constitution, and hence no search warrant was required.
Private search doctrine: Evidence unlawfully obtained from the defendant by a private person is admissible. The exclusionary rule is designed to protect privacy rights, with the Fourth Amendment applying specifically to government officials.
The third-party doctrine is a United States legal doctrine that holds that people who voluntarily give information to third parties—such as banks, phone companies, internet service providers (ISPs), and e-mail servers—have "no reasonable expectation of privacy" in that information.
Boyd v. United States, 116 U.S. 616 (1886) was a decision by the United States Supreme Court in which the Court held that "a search and seizure [was] equivalent [to] a compulsory production of a man's private papers" and that the search was "an 'unreasonable search and seizure' within the meaning of the Fourth Amendment."