The Supreme Court gave police broader search powers Monday during traffic stops, ruling that drug-sniffing dogs can be used to check out motorists even if officers have no reason to suspect they may be carrying narcotics.

In a 6-2 decision, the Court sided with Illinois police who stopped Roy Caballes in 1998 along Interstate 80 for driving 6 miles over the speed limit. Although Caballes lawfully produced his driver’s license, troopers brought over a drug dog after Caballes seemed nervous.