WASHINGTON – The Supreme Court said Tuesday that police may not extend an ordinary traffic stop to seek evidence of crimes unrelated to the offense that prompted officers to pull a vehicle over.

The justices voted 6-3 in favor of a driver who was found to have methamphetamine in his car. Dennys Rodriguez was issued a warning for driving on the shoulder of a Nebraska highway and then made to wait less than 10 minutes for officers to walk a drug-sniffing dog around the car. The dog alerted and a search of the vehicle turned up the drugs.