Also known as:knock and notice rule · knock-and-notice · knock-and-announce rule
Written by attorneys · grounded in primary & secondary sources — see below
A Fourth Amendment requirement that officers executing a search warrant knock and announce their presence before entering a dwelling absent exigent circumstances. The rule protects interests in life, property, privacy, and dignity during the moment of entry. Violation of the requirement does not trigger application of the exclusionary rule when officers otherwise hold a valid warrant.
Sources & Authorities
How it applies
Common Examples
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No Suppression for Unannounced Warrant Entry
Narcotics officers obtained a valid warrant to search Dana's apartment for diverted opioids. Believing drugs might be flushed, they forced the door without knocking or announcing and seized pill bottles and logs inside. Dana moved to suppress the evidence solely on the manner of entry. The court denied the motion because the officers possessed a valid warrant and the interests protected by the knock-and-notice rule are too attenuated from the evidentiary use of the seized items to justify exclusion.
Unannounced Entry into On-Call Room
Officers secured a valid warrant to search Clayton's hospital on-call room for evidence of narcotics diversion. They breached the locked door with a battering ram at dawn without knocking or announcing while Clayton slept after a long shift. They seized prescription bottles and patient files. Clayton moved to suppress the items based on the entry method. The court denied suppression because the knock-and-notice violation does not require exclusion when a valid warrant authorized the search.
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Cases
Dictionaries
Common questions
Frequently Asked
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Does a knock-and-notice violation require suppression of evidence seized under a valid warrant?+
No. The exclusionary rule does not apply to violations of the knock-and-notice requirement when officers execute a valid search warrant. The interests protected by the rule are too attenuated from the later evidentiary use of seized items, and the social costs of exclusion outweigh any marginal deterrent benefit.
What interests does the knock-and-notice rule protect?+
The rule protects life and safety by reducing the risk of violence during entry, prevents unnecessary property damage, and preserves occupants' privacy and dignity by giving them an opportunity to answer the door voluntarily.
What remedies remain available when officers violate the knock-and-notice rule?+
Alternative remedies such as civil suits under 42 U.S.C. § 1983 and internal police discipline can deter violations without the high costs of excluding reliable evidence obtained under a valid warrant.
547 U.S. 586 (2006)Criminal Procedure
…the truth-finding function of the judge and jury. Ibid. The exclusionary rule has never been applied to violations of the knock-and-announce rule. The interests protected by the knock-and-announce requirement—protection of life and limb, protection of property, and protection of privacy and dignity—have little to do with the seizure…
Criminal Law Constitutional ProtectionsConstitutional protections of accused persons · Arrest, search, and seizure [Fourth Amendment]NEXTGENFoundational