Memphis Mayhem (S05E05)

In Memphis, Tenn., drug habits are changing. Along Elvis Presley Blvd., addicts are switching to heroin as supplies of cocaine dry up following a successful kingpin takedown. Now, dealers with pockets stuffed full of cash are attracting deadly stick-up crews who roam the streets looking for easy targets. Ride alongside Memphis cops as they find themselves confronted by paranoid and trigger-happy dealers as they try to stop a heroin epidemic from engulfing the city. (National Geographic)