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The exclusionary rule does not apply in a civil case, in a grand jury proceeding, or in a parole revocation hearing.. The law in force at the time of the police action, not the time of the attempt to introduce the evidence, controls whether the action is illegal for exclusionary rule purposes.
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.
For criminal proceedings, the exclusionary rule prohibits entry of evidence obtained through an unreasonable search and seizure, such as one executed under an invalid search warrant. [2] However, the good-faith exemption allows evidence collected by law enforcement officers pursuant to a defective search warrant if the officers reasonably ...
First, the exclusionary rule is designed to deter police misconduct rather than to punish magistrates and judges for their errors. Only when a warrant is grounded upon an affidavit knowingly or recklessly false has the Court suppressed the evidence obtained as a result.
These include the exclusionary rule of criminal procedure, which prohibits the admission in a criminal trial of evidence gained by unconstitutional means, and the parol evidence rule of contract law, which prohibits the admission of extrinsic evidence of the contents of a written contract.
Murray v. United States, 487 U.S. 533 (1988), was a United States Supreme Court decision that created the modern "independent source doctrine" exception to the exclusionary rule. The exclusionary rule makes most evidence gathered through violations of the Fourth Amendment to the United States Constitution inadmissible in criminal trials as ...
Elkins appealed, arguing that evidence found by the officers should have been inadmissible under the exclusionary rule, which forbids the introduction of most evidence gathered through Fourth Amendment violations in criminal court. In a 5–4 decision, the Court overturned the silver platter doctrine and Elkins' conviction.
The rule spells out four exceptions to the rule of inadmissibility: evidence of a party's ownership of liability insurance—or of a party's failure to own liability insurance—is admissible to prove (1) a witness' bias or prejudice, i.e. for witness impeachment; (2) agency; (3) ownership; and (4) control.