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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. 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 ...

  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. Franks v. Delaware - Wikipedia

    en.wikipedia.org/wiki/Franks_v._Delaware

    The Supreme Court of the United States held that "Where the defendant makes a substantial preliminary showing that a false statement knowingly and intentionally, or with reckless disregard for the truth, was included by the affiant in the warrant affidavit, and if the allegedly false statement is necessary to the finding of probable cause, the ...

  7. Illinois v. Gates - Wikipedia

    en.wikipedia.org/wiki/Illinois_v._Gates

    Gates, probable cause was achieved for the warrant under the new "totality-of-the-circumstances" standard because the investigation by DEA and Detective Mader would have, on its own, been probable cause for a search warrant. [citation needed] The Gates' actions were suspicious because Florida is a known source of illegal drugs. Lance Gates ...

  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. Border search exception - Wikipedia

    en.wikipedia.org/wiki/Border_search_exception

    The Supreme Court expressly did not rule what level of suspicion would be necessary for a strip, body-cavity, or involuntary x-ray search, [27] though they did say that the only two standards for Fourth Amendment purposes short of a warrant were "reasonable suspicion" and "probable cause" (rejecting a "clear indication" standard).