Exigent circumstances refer to emergency situations that could cause harm and justify a warrantless search. They include situations where waiting for a warrant risks injury to police or others, destruction of evidence, or a suspect escaping. Examples of exigent circumstances are police pursuing a fleeing suspect or risking destruction of evidence. The Kentucky v. King and Missouri v. McNeely Supreme Court cases dealt with whether law enforcement actions could create an exigent circumstance allowing a warrantless search or if a warrant was still required.