In Brownsville, Texas, officers process an American citizen who crossed over the bridge 20 years ago and discover the reason he didn't want to come back.

Officers become suspicious when they pull over a businessman from Mexico who is making a rare journey to the United States in a brand new car.

Customs and Border Protection officers uncover 5,000 rounds of ammunition being smuggled across Hidalgo Bridge into Mexico; the Mexican drug cartels wage a bloody war for control of the most profitable smuggling routes into the United States.