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Criminal procedure
Investigating and charging crimes
Criminal investigation
Arrest warrant · Search warrant Probable cause · Knock-and-announce Exigent circumstance Reasonable suspicion Search and seizure · Search of persons Arrest  · Detention Right to silence · Miranda warning (U.S.) Grand jury
Criminal prosecution
Statute of limitations · Nolle prosequi Bill of attainder · Ex post facto law Criminal jurisdiction · Extradition Habeas corpus · Bail Inquisitorial system · Adversarial system
Charges and pleas
Arraignment · Indictment Plea · Peremptory plea Nolo contendere (U.S.) · Plea bargain Presentence Investigation
Related areas of law
Criminal defenses Criminal law · Evidence Civil procedure
Portals
Law · Criminal justice

An exigent circumstance, in the American law of criminal procedure, allows law enforcement to enter a structure without a warrant, or if they have a "knock and announce" warrant, without knocking and waiting for refusal under certain circumstances. It must be a situation where people are in imminent danger, evidence faces imminent destruction or a suspect will escape.

Generally, an emergency, a pressing necessity, or a set of circumstances requiring immediate attention or swift action. In the criminal procedure context, exigent circumstances means:

An emergency situation requiring swift action to prevent imminent danger to life or serious damage to property, or to forestall the imminent escape of a suspect, or destruction of evidence. There is no ready litmus test for determining whether such circumstances exist, and in each case the extraordinary situation must be measured by the facts known by officials.

People v. Ramey, 545 P.2d 1333,1341 (Cal. 1976).

United States v. McConney, 728 F.2d 1195, 1199 (9th Cir.), cert. denied, 469 U.S. 824 (1984): "Those circumstances that would cause a reasonable person to believe that entry (or other relevant prompt action) was necessary to prevent physical harm to the officers or other persons, the destruction of relevant evidence, the escape of a suspect, or some other consequence improperly frustrating legitimate law enforcement efforts."

Exigent circumstances may make a warrantless search constitutional if probable cause exists. The existence of exigent circumstances is a mixed question of law and fact. United States v. Anderson, 154 F. 3d 1225 (10th Cir, 1998) cert. denied 119 S. Ct. 2048 (1999) (citations omitted). There is no absolute test for determining if exigent circumstances exist, but general factors have been identified. These include: clear evidence of probable cause; the seriousness of the offense and likelihood of destruction of evidence; limitations on the search to minimize the intrusion only to preventing destruction of evidence; and clear indications of exigency.

Exigency may be determined by: degree of urgency involved; amount of time needed to get a warrant; whether evidence is about to be removed or destroyed; danger at the site; knowledge of the suspect that police are on his or her trail; and/or ready destructibility of the evidence. United States v. Reed, 935 F. 2d 641 (4th Cir.), cert. denied, 502 U.S. 960 (1991). In determining the time necessary to obtain a warrant, a telephonic warrant should be considered. As electronic data may be altered or eradicated in seconds, in a factually compelling case the doctrine of exigent circumstances will support a warrantless seizure.

Even in exigent circumstances, while a warrantless seizure may be permitted, a subsequent warrant to search may still be necessary. See Grosenheider, supra and United States v. David, 756 F. Supp. 1385 (D. Nev. 1991).

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