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

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

    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."

  4. Warrantless searches in the United States - Wikipedia

    en.wikipedia.org/wiki/Warrantless_searches_in...

    Warrantless searches are searches and seizures conducted without court-issued search warrants.. In the United States, warrantless searches are restricted under the Fourth Amendment to the United States Constitution, part of the Bill of Rights, which states, "The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not ...

  5. Probable cause - Wikipedia

    en.wikipedia.org/wiki/Probable_cause

    The usual definition of the probable cause standard includes “a reasonable amount of suspicion, supported by circumstances sufficiently strong to justify a prudent and cautious person’s belief that certain facts are probably true.” [6] Notably, this definition does not require that the person making the recognition must hold a public office or have public authority, which allows the ...

  6. 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 Fourth Amendment to the U.S. Constitution.

  7. United States v. Watson - Wikipedia

    en.wikipedia.org/wiki/United_States_v._Watson

    The Court reaches its conclusion that a warrant is not necessary for a police officer to make an arrest in a public place, so long as he has probable cause to believe a felony has been committed, on the basis of its views of precedent and history. As my Brother POWELL correctly observes, ante at 426-427, n. l (concurring), the precedent is ...

  8. 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.

  9. Good-faith exception - Wikipedia

    en.wikipedia.org/wiki/Good-faith_exception

    University of Tennessee Professor Thomas Y. Davies argues that Leon's objectively reasonable reliance test allows for evidence obtained from all but the most grossly deficient warrants, thereby obviating the Fourth Amendment's mandate that "no warrants shall issue, but upon probable cause", and that courts have commonly foregone performing an ...