Also known as: exclusionary rule · exclusionary-rule · exclusionary rule doctrine
Written by attorneys · grounded in primary & secondary sources — see below
A judicially created remedy that bars admission of evidence obtained through violations of the Fourth Amendment or other constitutional protections. The doctrine applies in both federal and state criminal proceedings to deter police misconduct by removing the incentive to conduct unlawful searches and seizures. Courts have recognized exceptions when the deterrent purpose would not be served, such as when officers act in objectively reasonable good faith or when evidence would have been discovered through lawful means anyway.
Emily Ellis was arrested in her apartment after state police conducted a warrantless search that violated the Fourth Amendment. The prosecution sought to introduce the seized documents at her trial in state court. The court suppressed the evidence because the exclusionary rule applies to state proceedings through the Fourteenth Amendment and requires exclusion of unconstitutionally obtained items.
Ethan Evans was stopped by an officer who relied on a dispatcher report of an active warrant that had actually been quashed due to an isolated database update failure. The officer arrested Evans and seized incriminating items from his vehicle. The court admitted the evidence under the good-faith exception because the officer's reliance on the report was objectively reasonable despite the clerical mistake.
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Ewan Eckhart's home was searched without a warrant and officers found stolen property. Prosecutors proved that a separate, lawful investigation already underway would have led officers to the same location and items within hours. The court admitted the evidence because the inevitable discovery exception allowed its use despite the initial constitutional violation.
Elena Estrada's residence was searched pursuant to a warrant later found to lack probable cause because the issuing magistrate had erred. Officers had no reason to know of the defect and relied on the warrant in good faith. The court denied suppression because the good-faith exception permits admission when officers act with objective reasonableness on a warrant issued by a neutral magistrate.
Eileen Epstein and a co-defendant were tried jointly. The co-defendant's confession implicating Epstein was introduced with a limiting instruction. The court held the confession inadmissible against Epstein because the exclusionary rule under confrontation principles bars its use when the declarant does not testify.
Esme Ellington was arrested after officers used information from an unlawful entry to locate her. The subsequent search yielded incriminating documents. The court suppressed the documents because they were obtained by exploiting the initial constitutional violation under the fruit-of-the-poisonous-tree doctrine.
Yes. The rule prohibits use of evidence obtained in violation of the Fourth Amendment in state proceedings through the Fourteenth Amendment's Due Process Clause, just as it applies in federal court.
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The exception applies when officers reasonably rely on a warrant that is later found defective due to clerical errors or lack of probable cause, provided the reliance is objectively reasonable and the warrant was issued by a neutral magistrate.
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Evidence remains admissible if the prosecution shows that police would have discovered it through lawful means even without the unconstitutional conduct.
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Derivative evidence obtained by exploiting an initial constitutional violation is also suppressed unless an exception such as attenuation, independent source, or inevitable discovery applies.
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…recently fixed as Department of Justice policy. See Beaney, Right to Counsel 29-30, 36-42 (1955). In Mapp , which imposed the exclusionary rule on the States for Fourth Amendment violations, more than half of the States had themselves already adopted some such rule. See 367 U. S., at 651. In Gideon , which extended Johnson v.…