The business of cocaine trafficking has changed over the years, with different players and routes. A look at how the trade really works.

MICAY CANYON, Colombia—One potent tributary in the surging cocaine pipeline begins in the mountains of Cauca province, where nearly every plot of arable land sprouts coca leaves. On Cesar Rosero’s ...

A United Nations report found a rise in users, confiscation and deaths as cocaine trafficking expands into Africa and Asia, and violence spreads into Europe. By Genevieve Glatsky Genevieve Glatsky ...