Trafficked US weapons are fueling violent crime in El Salvador and Guatemala; riding through Central America's notorious ganglands, Nelufar Hedayat investigates how the guns get there, and who pays the ultimate price.

Nelufar Hedayat investigates the black market behind the world's most trafficked mammal, the pangolin. She traces the smuggling route from the dining halls of China to the depths of the Indonesian jungle, where desperate hunters supply multi-million dollar syndicates.