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  2. 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."

  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. New Jersey v. T. L. O. - Wikipedia

    en.wikipedia.org/wiki/New_Jersey_v._T._L._O.

    New Jersey v. T. L. O., [fn 1] 469 U.S. 325 (1985), is a landmark decision by the Supreme Court of the United States which established the standards by which a public school official can search a student in a school environment without a search warrant, and to what extent.

  5. United States v. Grubbs - Wikipedia

    en.wikipedia.org/wiki/United_States_v._Grubbs

    The defendant had argued that anticipatory warrants in general violated the Fourth Amendment's requirement that "no Warrants shall issue, but upon probable cause," because the anticipated probable cause does not exist at the time of the warrant's issuance. The Court first noted that the courts of appeals had unanimously rejected this argument ...

  6. Special needs exception - Wikipedia

    en.wikipedia.org/wiki/Special_Needs_Exception

    The "special needs" exception is an exception to the Fourth Amendment’s general requirement that government searches be supported by a warrant and probable cause. [1] The exception applies when (1) the government conducts programmatic searches that are primarily aimed at advancing some special need other than criminal law enforcement, and (2) the government’s search program is reasonable ...

  7. Devenpeck v. Alford - Wikipedia

    en.wikipedia.org/wiki/Devenpeck_v._Alford

    Devenpeck v. Alford, 543 U.S. 146 (2004), was a United States Supreme Court decision dealing with warrantless arrests and the Fourth Amendment.The Court ruled that even if an officer wrongly arrests a suspect for one crime, the arrest may still be "reasonable" if there is objectively probable cause to believe that the suspect is involved in a different crime.

  8. 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 ...

  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 ...