Abstract Psilocybin and psilocin are indolealkylamines present in Central American Psilocybe species of mushrooms and in Panaeolus mushroom species of the United States (3,4). For thousands of years, Mexican Native Americans have eaten Psilocybe mushrooms ritualistically for their hallucinatory and psychedelic (“mind-revealing”) properties. In the United States during the 1980s, recreational...