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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. 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.

  5. Payton v. New York - Wikipedia

    en.wikipedia.org/wiki/Payton_v._New_York

    Payton v. New York, 445 U.S. 573 (1980), was a United States Supreme Court case concerning warrantless entry into a private home in order to make a felony arrest.The Court struck down a New York statute providing for such warrantless entries because the Fourth Amendment draws a firm line at the entrance to the house.

  6. 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 ...

  7. United States v. Ross - Wikipedia

    en.wikipedia.org/wiki/United_States_v._Ross

    United States, 267 U.S. 132 (1925), where the Supreme Court ruled that police officers may make a warrantless search of an automobile if they have probable cause to suspect that it contains contraband. This is known as the "automobile exception" to the Fourth Amendment's warrant requirement. The court's reasoning in Carroll v.

  8. Probable cause - Wikipedia

    en.wikipedia.org/wiki/Probable_cause

    Jardines [17] the court ruled that a police officer and narcotic-sniffing dog entering the porch of a home constitutes a search which invokes the requirement of probable cause or a valid search warrant The power of probable cause by K-9 units smelling for drugs is not limited to just airports, but even in schools, public parking lots, high ...

  9. Digital Search and Seizure - Wikipedia

    en.wikipedia.org/wiki/Digital_Search_and_Seizure

    Subpoenas do not have the same threshold of probable cause as required by search warrants under the Fourth Amendment. [6] Lastly, ISPs are generally private entities, therefore they can voluntarily search their users records and voluntarily turn them over to the government without violating the Fourth Amendment. [6]