Definition of exclusionary rule
: a legal rule that bars unlawfully obtained evidence from being used in court proceedings
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First Known Use of exclusionary rule
1938
Law Dictionary
exclusionary rule
legal Definition of exclusionary rule
: any of various rules that exclude or suppress evidence;
specifically
: a rule of evidence that excludes or suppresses evidence obtained in violation of a defendant's constitutional rights — see also fruit of the poisonous tree, good faith exception, Mapp v. Ohio and Wong Sun v. United States
Note:
The U.S. Supreme Court established the rule that evidence gathered by a governmental agent in violation of especially the Fourth and Fifth Amendments to the U.S. Constitution cannot be admitted against a defendant. The rule is available primarily in criminal trials or quasi-criminal proceedings (as punitive administrative hearings) and must also be observed by state courts. There are various statutory exclusionary rules in addition to the rule established by the Supreme Court.
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