Marijuana Movie - The Serpent and the Rainbow

Before zombie money was influencing many Hollywood projects, we had Bill Pullman running around Haiti trying to find the chemical compound to turns people into zombies (while not getting turned into one himself). The film’s source material came from a very dry nonfiction book of the same title (yes, I read it) which was developed into this outlandish movie, barely resembling itself at all.

So yes, you are correct. This is not a documentary, but is still worth checking out.