Supreme Court of the United States December 8, 1998, 97-7597 (Knowles v. Iowa)

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 foil search of the car. We answer this question "no.