There were allegations that CIA controls the flow drugs in and out of US. There has been evidence that CIA was sponsoring war that was going on secretly in Laos from 1961 to 1975.It was then accused of trafficking heroin in Golden Triangle area.
Also during the Vietnam War, they had 30000 tribesmen working in their opium poppy fields before blaming it on a Mafia family from Florida that had established heroin refining regional lab. The CIA soon took their people out. CIA responded by saying that it was legal to trade in opium in Laos until 1971.