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.

When a traveler tells an officer he doesn't remember the code to open his suitcase, the bolt cutters come out. K9 Magnus alerts to a strange odor coming from the floor of a plane that just arrived from the Dominican Republic.

A man is referred for questioning after failing to declare the full contents of his luggage, which contains a half-cooked Ghanaian delicacy.

Rising tariffs tempt some citizens to go abroad to buy luxury goods, where items can be up to 40 percent cheaper, then bring them home without paying the proper duty. A traveler returning from Italy claims she has a $50,000 watch belonging to her brother.

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 find a fraudulent passport hidden in a video game case.

A Scottish teenager claims that he's come to meet his girlfriend from a gaming website; when a couple arrives with a large amount of cash split into bundles, officers dig deeper and see that the man is under investigation by the FBI.

In Atlanta, an officer discovers evidence of a lottery scam, a tactic used by criminals to trick victims into giving thousands of dollars in exchange for alleged winnings. This find could lead CBP to uncover the network behind this nefarious play.

After two unclaimed cargo packages are opened, experts are called in after officers suspect that they may contain stolen ancient artifacts. When a family heading to the Middle East is found carrying more than the allowed $10,000 limit, questions arise.