Next airing Sun Aug 28, 10 a.m. ET

Bullets Over the Border

The Rio Grande Valley sector of South Texas contains 17,000 square miles of borderland. Agents must be on constant alert to thwart a bold network of drug trafficking and human smuggling. In this episode, they put themselves in harm's way searching for armed smugglers fleeing a shoot-out with the Mexican military. Once at the riverbanks, they find a suspected smuggler who has been shot five times. Their mission quickly changes as they rush to save the man's life.