Police set up a highway checkpoint to obtain information from motorists about a hit-and-run accident occurring about one week earlier at the same location and time of night. Officers stopped each vehicle for 10 to 15 seconds, asked the occupants whether they had seen anything happen there the previous weekend, and handed each driver a flyer describing and requesting information about the accident. As respondent Lidster approached, his minivan swerved, nearly hitting an officer. The officer smelled alcohol on Lidster's breath. Another officer administered a sobriety test and then arrested Lidster. He was convicted in Illinois state court of driving under the influence of alcohol. He challenged his arrest and conviction on the ground that the government obtained evidence through use of a checkpoint stop that violated the Fourth Amendment. The trial court rejected that challenge, but the state appellate court reversed. The State Supreme Court agreed, holding that, in light of Indianapolis v. Edmond, 531 U. S. 32, the stop was unconstitutional.

Held: The checkpoint stop did not violate the Fourth Amendment. Pp. 2-8.

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