Next airing Fri Mar 30, 2 p.m. ET

Meth Mobile

Drug smuggling has reached 'Texas-sized' proportions in the Rio Grande Valley. A canine unit detects a suspicious vehicle coming in from Mexico, and agents discover a massive quantity of methamphetamine concealed within. Within walking distance of the Mexican border, Brownsville PD and Border Patrol K-9 units discover a suspicious-looking vehicle awaiting export into Mexico, and are shocked to uncover an entire payload containing thousands of rounds of ammunition and weapons.