Watch FRONTLINE's documentary examining how Ecuador is now gripped by drug cartels, violence and a military crackdown.

FRESNO Calif. -- The face of drug use in America is changing. Fentanyl, a highly addictive opioid, is making its way into the bedrooms of teenagers, often with just a few text messages or a few taps ...

"The message is clear. Everything is fine. Nothing to see. Everything is fine," Carol Becker writes. "The strategy of denial.