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

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

    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." [1] Johnson is commonly cited for the proposition that the Fourth Amendment creates a "warrant requirement" for searches, and warrantless searches are "per se unreasonable."

  3. 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 ...

  4. County of Riverside v. McLaughlin - Wikipedia

    en.wikipedia.org/wiki/County_of_Riverside_v...

    County of Riverside v. McLaughlin, 500 U.S. 44 (1991), was a United States Supreme Court case which involved the question of within what period of time must a suspect arrested without a warrant (warrantless arrests) be brought into court to determine if there is probable cause for holding the suspect in custody.

  5. Riley v. California - Wikipedia

    en.wikipedia.org/wiki/Riley_v._California

    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 from various state ...

  6. Florida v. Royer - Wikipedia

    en.wikipedia.org/wiki/Florida_v._Royer

    Florida v. Royer, 460 U.S. 491 (1983), was a U.S. Supreme Court case dealing with issues involving the Fourth Amendment. Specifically, the case establishes a firm line in cases where police conduct search and seizure without a warrant. The court ruled that, while it is legal for authorities to target and approach a person based on their ...

  7. United States v. Leon - Wikipedia

    en.wikipedia.org/wiki/United_States_v._Leon

    An officer acting in good faith and within the scope of a search warrant should not be subjected to Fourth Amendment constitutional violations. It is the magistrate’s or judge’s responsibility to ascertain whether the warrant is supported by sufficient information to support probable cause.

  8. United States v. Grubbs - Wikipedia

    en.wikipedia.org/wiki/United_States_v._Grubbs

    When the anticipatory warrant is predicated on a triggering condition, the Fourth Amendment requires that there is probable cause to believe that the triggering condition will occur, and that if it occurs, that there is a fair probability that the contraband will be found at the place to be searched. In this case, the warrant application ...

  9. Michigan v. Summers - Wikipedia

    en.wikipedia.org/wiki/Michigan_v._Summers

    Michigan v. Summers, 452 U.S. 692 (1981), was a 6–3 decision by the United States Supreme Court which held for Fourth Amendment purposes, a warrant to search for contraband founded on probable cause implicitly carries with it the limited authority to detain the occupants of the premises while a proper search is conducted.