WASHINGTON (AP) — The Supreme Court says 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 Tuesday 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 the arrival of a drug-sniffing dog. The dog alerted and a search of the vehicle turned up the drugs.

But Justice Ruth Bader Ginsburg said in her majority opinion that prolonging the traffic stop beyond the time needed to deal with the initial offense was improper, even if only for a few minutes.