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  2. Fourth Amendment to the United States Constitution - Wikipedia

    en.wikipedia.org/wiki/Fourth_Amendment_to_the...

    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 ...

  3. Expectation of privacy (United States) - Wikipedia

    en.wikipedia.org/wiki/Expectation_of_privacy...

    In United States constitutional law, expectation of privacy is a legal test which is crucial in defining the scope of the applicability of the privacy protections of the Fourth Amendment to the U.S. Constitution. It is related to, but is not the same as, a right to privacy, a much broader concept which is found in many legal systems (see ...

  4. Katz v. United States - Wikipedia

    en.wikipedia.org/wiki/Katz_v._United_States

    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. [1] The ruling expanded the Fourth Amendment's protections from an individual's "persons, houses ...

  5. Plain view doctrine - Wikipedia

    en.wikipedia.org/wiki/Plain_view_doctrine

    Plain view doctrine. In the United States, the plain view doctrine is an exception to the Fourth Amendment 's warrant requirement [1] that allows an officer to seize evidence and contraband that are found in plain view during a lawful observation. The doctrine is also regularly used by Transportation Security Administration officers while ...

  6. United States free speech exceptions - Wikipedia

    en.wikipedia.org/wiki/United_States_free_speech...

    United States free speech exceptions. In the United States, some categories of speech are not protected by the First Amendment. According to the Supreme Court of the United States, the U.S. Constitution protects free speech while allowing limitations on certain categories of speech. [1] Categories of speech that are given lesser or no ...

  7. Freedom of speech in the United States - Wikipedia

    en.wikipedia.org/wiki/Freedom_of_speech_in_the...

    The First Amendment affords the broadest protection to such political expression in order 'to assure (the) unfettered interchange of ideas for the bringing about of political and social changes desired by the people.' Restrictions placed upon core political speech must weather strict scrutiny analysis or they will be struck down. The Supreme ...

  8. Motor vehicle exception - Wikipedia

    en.wikipedia.org/wiki/Motor_vehicle_exception

    San Francisco Police searching a vehicle after a stop in 2008.. The motor vehicle exception is a legal rule in the United States that modifies the normal probable cause requirement of the Fourth Amendment to the United States Constitution and, when applicable, allows a police officer to search a motor vehicle without a search warrant.

  9. Equal Protection Clause - Wikipedia

    en.wikipedia.org/wiki/Equal_Protection_Clause

    As a whole, the Fourteenth Amendment marked a large shift in American constitutionalism, by applying substantially more constitutional restrictions against the states than had applied before the Civil War. The meaning of the Equal Protection Clause has been the subject of much debate, and inspired the well-known phrase "Equal Justice Under Law".