Both tested positive for cocaine, as well as harmine and harmaline. But Socha and her colleagues found no sign of mescaline (another common hallucinogenic), DMT, or cocaethylene.

The Sharanahua and Culina, small Indian tribes located in the southwestern Amazon basin, use a hallucinogenic drink for medicinal and social purposes. This decoction, called "Ayahuasca" in Peru, is ...