The Serpent and the Rainbow (book)

The book presents the case of Clairvius Narcisse, a man who had been a zombie for two years, as showing that the zombification process was more likely the result of a complex interaction of tetrodotoxin, a powerful hallucinogenic plant called Datura, and cultural forces and beliefs.[1]

According to the book, the assortment of ingredients in Haitian zombie powder include puffer fish, matter from a corpse (specifically to Davis' adventure in Haiti, the bokor, a Haitian shaman, crushed the skull of a deceased infant that had been dead for a month or two, and added it to the poison), freshly killed blue lizards, a large dried toad (Bufo marinus) with a dried sea worm wrapped around it (prepared beforehand), "tcha-tcha" (Albizzia), and "itching pea" (pois grater, a species of Mucuna).[2]

The book inspired the 1988 horror film, The Serpent and the Rainbow.

Davis' claims were criticized for a number of scientific inaccuracies.[3] Some scientists found little or no tetrodotoxin in samples provided by Davis.[4] Davis argued that a number of factors may account for the negative results of some investigators and decried their unsubstantiated accusations of fraud, noting the variability of formulations, possible errors in the testing performed on the samples he brought back, the possibility that the tetrodotoxin-based mixture may have had ingredients that improved blood–brain barrier transmission of the tetrodotoxin, and the nature of folk medicine with respect to success rates (i.e., that very few successes are required to establish credibility).[5]

In the book, Davis does not suggest that the zombie powder containing tetrodotoxin was used for maintaining "mental slaves", but for producing the initial death and resurrection that convinced the victims and those who knew them that they had become zombies. The zombies, such as Clairvius Narcisse, were kept biddable by regular doses of the poisonous plant, Datura stramonium, which produces amnesia, delirium, and suggestibility.