When night falls on South Texas, the Rio Grande comes to life with drug smugglers. Border Patrol counters this by dispatching highly-trained Special Operations units.
The Falfurrias checkpoint in South Texas cracks down on drug and human traffickers. The inspections are so effective migrants and smugglers hike 40 miles around the checkpoint.
A craze known as `Five Dollar Insanity" hits South Florida, as law enforcement battles Flakka, a dangerous new synthetic drug that has invaded the streets.
St Louis DEA expands its investigation into a suspected heroin dealer who has so far dodged them at every turn and contributed to the growing epidemic on the streets.
DEA agents in St Louis tackle a growing heroin epidemic, one dealer at a time. And St Louis law enforcement pulls out every stop to reverse the city's culture of drugs.
