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Mariana heads to a Southeast Asian hotbed of scamming, where criminal organizations are holding thousands of hostages and forcing them to scam.

Mariana investigates the dirty business of bogus addiction treatment.

Mariana van Zeller goes undercover to become the target of a romance scam.

Mariana launches an investigation into a complex scam that targets seniors, tricking them into becoming drug mules.

HSI partners with Colombian National Police to dismantle illegal gold mining operations; CBP thwarts cartel activity in Texas.

HSI money laundering stings; CBP's largest drug seizure in LAX history.

HSI runs a human trafficking sting; CBP arrests a domestic terror suspect.

CBP's K9 sniffs out hidden cash; HSI intercepts a $2 million drug deal.