In 2003, Popper was arrested for possession of marijuana. Popper was arrested again on March 6, 2007 near Ritzville, Washington by the Washington State Patrol. He was the Passenger in his own vehicle, which was stopped for speeding, and was found to be in the possession of a small amount of marijuana and weapons. Popper was released the same night. The vehicle had a stash of hidden compartments which contained four rifles, nine handguns, a switchblade knife, a Taser, a set of brass knuckles, and night vision goggles. The vehicle was temporarily seized.