Police
detaining motorists on the side of the highway to await search from a drug dog is unconstitutional as it violates the Fourth Amendment, according to a 6 to 3 ruling by the United States Supreme Court.
Prior to the ruling, it was commonplace for law enforcement across the country to detain drivers on the side of the highway to await a search by a drug dog. The cop would then use alerts from said dog to find “probable cause” to search the vehicle.