Peter Berg, the creator of the hit TV show “Friday Night Lights,” is back with his latest series “Painkiller,” a gut-wrenching and relentless look at the opioid crisis and the role of Purdue Pharma, the makers of OxyContin. Peter breaks down the path from drugs made in labs to marketers, to doctors, to patients, and why he decided to feature actual testimonials from the families of overdose victims in the series.