Strong, opium-based painkillers like Oxycontin were traditionally only given to cancer sufferers. But from the mid-1990s, they were rebranded and aggressively marketed for all types of pain. Patients were assured that these highly addictive drugs were completely safe. By the time the dangers of these pills became apparent and regulators started restricting access, it was too late. Follow those trying to reverse the trend: addicts struggling to get clean, lawyers and prosecutors trying to hold Big Pharma accountable and the police force building prevention.