A U.S. Border Patrol canine alerted to a truck at the Highway 78 checkpoint near Blythe Thursday morning.

The truck was stopped at the checkpoint at about 3:30 a.m. when the canine team alerted to the vehicle. A search led to the discovery of one-half pound of methamphetamine in the center console of the truck and a loaded 9 mm handgun near the front passenger seat. The vehicle's occupants , three U.S. citizens from Wyoming , were arrested.