http://en.wikipedia.org/wiki/Arizona_v._Gant" onclick="window.open(this.href);return false;
Arizona v. Gant, 556 U.S. ___ (2009), was a United States Supreme Court decision which held that the Fourth Amendment to the United States Constitution requires law enforcement officers to demonstrate an actual and continuing threat to their safety posed by an arrestee, or a need to preserve evidence related to the crime of arrest from tampering by the arrestee, in order to justify a warrantless vehicular search incident to arrest conducted after the vehicle's recent occupants have been arrested and secured.
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In an opinion delivered by Justice Stevens, the Supreme Court held that police may search the passenger compartment of a vehicle incident to a recent occupant’s arrest only if it is reasonable to believe that the arrestee might access the vehicle at the time of the search or that the vehicle contains evidence of the offense of arrest.
Justice Scalia wrote a concurring opinion, "In my view we should simply abandon the Belton-Thornton charade of officer safety and overrule those cases. I would hold that a vehicle search incident to arrest is ipso facto “reasonable” only when the object of the search is evidence of the crime for which the arrest was made, or of another crime that the officer has probable cause to believe occurred."