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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. 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.

  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. United States v. Mendenhall - Wikipedia

    en.wikipedia.org/wiki/United_States_V._Mendenhall

    A person is "seized" within the meaning of the Fourth Amendment if a "reasonable person" in the same position "would have believed that he was not free to leave." This test must be viewed under the totality of the circumstances. Court membership; Chief Justice Warren E. Burger Associate Justices William J. Brennan Jr. · Potter Stewart

  6. Mapp v. Ohio - Wikipedia

    en.wikipedia.org/wiki/Mapp_v._Ohio

    Mapp v. Ohio, 367 U.S. 643 (1961), was a landmark U.S. Supreme Court decision in which the Court ruled that the exclusionary rule, which prevents a prosecutor from using evidence that was obtained by violating the Fourth Amendment to the U.S. Constitution, applies to states as well as the federal government.

  7. Wolf v. Colorado - Wikipedia

    en.wikipedia.org/wiki/Wolf_v._Colorado

    Wolf v. Colorado, 338 U.S. 25 (1949), was a United States Supreme Court case in which the Court held 6—3 that, while the Fourth Amendment was applicable to the states, the exclusionary rule was not a necessary ingredient of the Fourth Amendment's right against warrantless and unreasonable searches and seizures.

  8. Mere evidence rule - Wikipedia

    en.wikipedia.org/wiki/Mere_evidence_rule

    The Court embraced the 4th Amendment as a protector of a right to privacy. The Court recognized that while the rejection of the mere evidence rule may "enlarge the area of permissible searches," the protections of the 4th Amendment, like the reasonableness and warrant requirements, would sufficiently safeguard the right to privacy. [11]

  9. United States v. Leon - Wikipedia

    en.wikipedia.org/wiki/United_States_v._Leon

    Justice William Brennan filed a dissenting opinion, joined by Justice Thurgood Marshall, arguing that the Fourth Amendment of the Constitution must be read to condemn not only the initial unconstitutional invasion of privacy, but also the subsequent use of any illegally obtained evidence. The exclusionary rule was part and parcel of the Fourth ...