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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.
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.
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 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.
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.
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.
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.
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.
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 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.
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.