Louis Theroux joins the Philadelphia Police Department patrolling the most dangerous part of one of the most violent cities in America.

The incredible story of Pablo Escobar, the infamous boss of Colombia's Medellin drug cartel, told by his son, Sebastian, and his widow, Maria Isabel Santos.

Mexico's drug wars have been well reported, but there is a frightening, new phenomenon that is going largely unnoticed. A growing number of journalists are being killed or 'disappeared' as they try to report on drug violence and the growing links between the cartels and the corrupt police and politicians.