Chief Justice Rehnquist delivered the opinion of the Court.
An Iowa police officer stopped petitioner Knowles for speeding, but issued him a citation rather than arresting him. The question presented is whether such a procedure authorizes the officer, consistently with the Fourth Amendment, to conduct a full search of the car. We answer this question "no."
Knowles was stopped in Newton, Iowa, after having been clocked driving 43 miles per hour on a road where...
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