Professor McCoy started investigating the drug trafficking in the 1950s, questioning people in all phases of the drug culture from the growers to the end users. He spent considerable time in Southeast Asia and throughout the world obtaining first-hand knowledge of the drug trade. His books describe how CIA helicopters, supposedly fighting communists in Vietnam, were hauling drugs from the fields to distribution points, and how this CIA operation included heavy sales to the American GIs. McCoy described the role of the PepsiCo bottling plant in the drug processing.
