A Wyoming Highway Patrol trooper stopped an eastbound car on Interstate 80 for following too closely on 4 August 2013, and the driver, Porn Souwankham of Minnesota, agreed to a search of the vehicle.[1] In the trunk, troopers found just over 88 pounds of marijuana (about 39.9 kg) in three duffle bags, with an estimated street value of about $528,000.[1]

Souwankham was arrested and faces felony charges of possession of a controlled substance and possession with intent to deliver.[1] Agents of the Wyoming Division of Criminal Investigation are assisting the Highway Patrol, which believes he was carrying the marijuana across Wyoming for delivery out of state; the case remains under investigation.[1]