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Officers identify a powder used to make designer drugs and the search begins for where it came from and who it was for; officers receive a tip-off about a traveler from someone who supposedly knows her well, saying she's planning to smuggle drugs.
A traveler claims he's shocked by the discovery of a firearm in his luggage; officers question a luxury fountain pen maker; her story of coming to the U.S. for a vacation raises suspicions that she may be planning to work while she's here.
Officers investigate an academic returning from the Dominican Republic with dead specimens; a tip comes in about a traveler running a massage parlor linked to sex trafficking. Drugs worth $1,000,000 are intercepted before leaving the United States.
Two UK women are questioned after one of them barely resembles her passport photo, and the officer suspects her documents are forged; a man returning home from an antique coin auction provides an officer with an ancient history lesson.
A man is referred for questioning after failing to declare the full contents of his luggage, which contains a half-cooked Ghanaian delicacy.
A passenger arriving from Cairo has brought some extra carry-ons that interest officers; an American fashion designer returning from Paris fails to declare nearly $20,000 worth of luxury goods; a bag of snails from West Africa raises suspicions.
Officers grow suspicious of a traveler who is about to board his second flight within 24 hours to and from Canada.
Intel arrives, sending officers searching for two suspected narcotics smugglers flying in from London; agriculture specialists get more than they bargained for when a passenger lands with some illegal and foul-smelling items.
Air cargo officers investigate a drug-smuggling operation that uses the postal service to export marijuana abroad; when vials of a mysterious powder arrive from China, officers suspect they may be dangerous counterfeit clinical skincare injections.
While officers inspect a cargo shipment for illegal marijuana, an X-ray reveals some lewd contents; a character attracts officers' attention for bringing medications they suspect he intends to sell at an alternative lifestyle festival.
Officers get intelligence on a passenger heading to London carrying an illicit load; when questioned, the man says he's meeting with Braveheart; a shipment of high-end construction equipment throws up red flags when its quality looks shoddy.
Officers inspect an old computer that looks like it's hiding something suspicious; a man entering with a commercial amount of Betta fish claims he's importing them for personal use, although the species is often bred for illegal fish fighting.
A man arrives with what looks like multiple rounds of high-caliber bullets in his suitcase; when a K-9 alerts to a harmless box of kids' games, officers find more than they bargained for; Officers are alarmed by a traveler's strong-smelling soap.
Officers find chessboards loaded with more than 32 pieces; a couple who claimed only half the purchases they made abroad face a hefty fine and having their items seized; two travelers attempting to avoid immigration questions get caught.
Officers find a fraudulent passport hidden in a video game case, a telltale sign of criminals at work; a traveler who just returns from Paris claims she has nothing to declare, but a search of her bags reveals a suspicious $200,000 diamond watch.
After being detained for public intoxication, a woman is found to have overstayed her visa; a man who has been on the run for 15 years is apprehended; a traveler is questioned for her connections to the leader of a car theft gang.
Officers find a box of syringes filled with a mysterious black liquid; a computer programmer from South Korea raises suspicions when he says he's coming for business meetings, but it sounds like he's planning to work in the US illegally.
An agriculture dog alerts to a suitcase coming from Ethiopia, and inspection reveals a tough hide; a plain-clothes officer in baggage claim finds a passenger acting suspiciously; a woman from Japan accuses officers of assuming she's a prostitute.