Officers in Laredo intercept a truck smuggling narcotics over the border, and a courier heading to Mexico is caught delivering guns and ammunition in Eagle Pass.

A pedestrian is caught at Hidalgo Bridge smuggling narcotics in bags of coffee, and a nervous woman in Progreso is taken for a pat down.

Officers find a suspicious compartment within the trailer of a truck returning to Texas, and a man hides over 300 cheap forms of medication about his person in Progreso.

Officers in Hidalgo seize over 200 kilos of methamphetamine concealed in a car, and the hunt is on in Detroit for some invasive insects which could destroy the US timber industry.

A man wanted for serious sexual offences is apprehended in Progreso, and agents intercept a group of migrants moments after they cross the Rio Grande river.

Officers in Progreso detain a man who makes a dash back towards Mexico, and the team in Laredo uncovers methamphetamine concealed in a shipment of landscaping stone.

Officers at Eagle Pass intercept a driver smuggling narcotics over the border, and a group of passengers in Laredo refuse to admit to owning an air compressor full of rifles.

Officers find a manmade compartment within the trailer of a truck returning Stateside, and two Americans arouse suspicions with an unsafe lane change at the US-Canada border.

Border officers in Detroit apprehend a woman after finding a handgun and ammunition in her vehicle, and officers in Eagle Pass find $150,000-worth of methamphetamine.

A man fears for his life after being stopped by a cartel in Laredo, clubbers in Detroit are found with drugs disguised in liquid, and officers stop a shipment of frozen rats.

Officers hand over a convict to Mexican authorities in the middle of the Juarez Lincoln bridge, and a man drops a marijuana joint on a customs floor in Progreso.

More stories from the documentary series that looks at the 28 bridges that cross the notorious Rio Grande, between Texas and Mexico, and provide a gateway for legitimate goods and a lucrative pipeline for illegal contraband, weapons and drugs. Officers in Eagle Pass seize over 15 kilograms of heroin and unveil a new cartel drug-smuggling tactic, and a Mexican family in Laredo makes a plea for humanitarian parole.