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  2. Fourth Amendment to the United States Constitution - Wikipedia

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

    The Fourth Amendment was introduced in Congress in 1789 by James Madison, along with the other amendments in the Bill of Rights, in response to Anti-Federalist objections to the new Constitution. Congress submitted the amendment to the states on September 28, 1789. By December 15, 1791, the necessary three-fourths of the states had ratified it.

  3. 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 ...

  4. 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 ...

  5. Carpenter v. United States - Wikipedia

    en.wikipedia.org/wiki/Carpenter_v._United_States

    Carpenter v. United States, 585 U.S. 296 (2018), is a landmark United States Supreme Court case concerning the privacy of historical cell site location information (CSLI). The Court held that the government violates the Fourth Amendment to the United States Constitution when it accesses historical CSLI records containing the physical locations of cellphones without a search warrant.

  6. Johnson v. United States (1948 Fourth Amendment case)

    en.wikipedia.org/wiki/Johnson_v._United_States...

    Laws applied. U.S. Const. Amend. IV. Johnson v. United States, 333 U.S. 10 (1948), was a significant United States Supreme Court decision addressing search warrants and the Fourth Amendment. In this case, where federal agents had probable cause to search a hotel room but did not obtain a warrant, the Court declared the search was "unreasonable."

  7. Riley v. California - Wikipedia

    en.wikipedia.org/wiki/Riley_v._California

    Diaz (2011) Riley v. California, 573 U.S. 373 (2014), [1] is a landmark United States Supreme Court case in which the court ruled that the warrantless search and seizure of the digital contents of a cell phone during an arrest is unconstitutional under the Fourth Amendment. [2][3] The case arose from inconsistent rulings on cell phone searches ...

  8. Privacy laws of the United States - Wikipedia

    en.wikipedia.org/wiki/Privacy_laws_of_the_United...

    These include the Fourth Amendment right to be free of unwarranted search or seizure, the First Amendment right to free assembly, and the Fourteenth Amendment due process right, recognized by the Supreme Court of the United States as protecting a general right to privacy within family, marriage, motherhood, procreation, and child rearing. [2] [3]

  9. Lange v. California - Wikipedia

    en.wikipedia.org/wiki/Lange_v._California

    IV. Lange v. California, 594 U.S. ___ (2021), was a United States Supreme Court case involving the exigent circumstances requirement related to the Fourth Amendment to the United States Constitution. The Court ruled unanimously that the warrantless entry into a home by police in pursuit of a misdemeanant is not unequivocally justified.