Contraband: Seized at the Border

A driver claims he buys used cars over the border to import into the U.S., but an X-ray reveals something suspicious in his spare tire. When a traveler returning from Mexico declares protein-rich snacks at Customs, a Fish & Wildlife expert is called in.

With cartels using drones for surveillance and transport of narcotics and explosives, a newly formed CBP drone strike unit is taking aim at cartel eyes in the sky. An officer suspects that a vehicle may be carrying more than some innocent Santeria sprays.

Officers find an 18-wheeler carrying more than a load of takeout containers. A couple raises suspicion after declaring bulldog semen, but the labeling suggests the box may actually contain stallion semen -- a valuable and tightly regulated substance.

During his first day on the job, a rookie officer relies on his training, sending a hesitant driver for further inspection -- and his hunch pays off. When a traveler claims to be visiting his dentist bimonthly in Mexico, officers investigate further.

A traveler is caught with blades for cockfighting, a cartel-run blood sport. Every year, Mexico grows millions of dollars of flowers for the U.S., but cartels are taking advantage of the influx of shipments during major holidays to stash something extra.

Two men arrive in an SUV carrying enough suitcases for an entire family. Officers discover it's no family car -- it's a Kevlar-lined, bulletproof tank, the type that the cartels use to transport high-ranking gang members and attack law enforcement.

Cartels hope CBP won't inspect happy families, but officers know not to fall for that smuggling trick. Due to avian flu, live chickens can't be brought into the U.S. A family is forced to choose: go home to save their pet or surrender the bird to CBP.

Each year, CBP recovers over 1,300 stolen vehicles at ports of entry. Many are heading to the black market, while cartels use others for trafficking. When officers receive a "be on the lookout" (BOLO) alert for a luxury car, they take it seriously.

Tourist Day celebrates the thousands of Americans who migrate south during the winter months. With 11,000 visitors expected, officers are preparing themselves for festivities fueled by alcohol and drugs -- and smugglers taking advantage of the crowds.

Officers are caught off guard when a high-end sports car arrives at the border packing heat. At the bus terminal, a K9 alerts to a traveler's luggage. Upon investigation, officers find photographs showing large amounts of cash on her phone.