On appeal by Arizona to the U.S. Supreme Court, the State argued that most jurisdictions have relied for the past 28 years on the "bright-line rule" of Belton, under which the search of Gant's car was lawful. Affirming the suppression ruling, the Supreme Court acknowledged this longstanding reliance, but decided nevertheless to replace the Belton "bright line" with a dimmer and more dangerous one: "Police may search a vehicle incident to a recent occupant's arrest only if the arrestee is within reaching distance of the passenger compartment at the time of the search or it is reasonable to believe the vehicle contains evidence of the offense of arrest."
The court sought to analogize Gant's vehicle search to the search of a house, as considered in the 1969 opinion in Chimel v. California. In Chimel, the court said that when a person is arrested inside a residence, the scope of search is limited to the area within the arrestee's immediate control; viewing the passenger compartment of a vehicle as being beyond the immediate control of a handcuffed arrestee who is locked in the back of a patrol car, the court ruled by a 5 to 4 vote that the search of Gant's car violated the Chimel rule.
Logicians and scholars will find much to criticize in the Gant decision. For example, Belton had expressly found that the passenger compartment is "generally, even if not inevitably," within an arrestee's reach. This generalization was said to satisfy the scope-of-search rule of Chimel. Also, the issue in Chimel was not whether a search incident to arrest could be conducted after a person was taken into custody and secured, but the scope of such a search; by contrast, the issue in Gant was not the scope of search, but whether officers could search Gant's car after securing him. Chimel does not address this issue.
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However, working police officers (unlike justices of the Supreme Court) must constantly and quickly assess unpredictable real-world situations where split-second choices not only could spell trouble for a criminal prosecution but might also threaten personal survival. You do not have the luxury of indulging in academic examinations of the reasoning fallacies committed by the courts. Your need is for understandable rules that you can apply on the street. Although Gant has changed the rules and left many unanswered questions, at least three aspects of the ruling seem to be discernible.