Mariana investigates the scammers luring addicts into fraudulent sober homes while billing health programs for billions in bogus treatments.

Mariana investigates the global phenomenon of armored car heists, responsible for some of the most brazen and dangerous robberies in the world.

Mariana travels to Vietnam to investigate reports that young women are being trafficked into China to be sold as unwilling brides.

With the arrival of a deadly new fentanyl cocktail on the streets, Mariana heads to Mexico to investigate the next wave of America's opioid crisis.