"One country's sacrament is another's illicit drug, as officials in South America and the United States are well aware. For centuries, a hallucinogenic tea made from a giant vine native to the Amazonian rainforest has been taken as a religious sacrament across several cultures in South America." "In this book, de Rios and Rumrrill take us inside the history and realm of, as well as the raging arguments about, the substance that seems a sacrament to some and a scourge to others. Opponents fight its use, even as U.S. scientists and psychologists continue investigations of whether ayahuasca has healing properties that might be put to conventional use for physical and mental health. This book includes text from the United Nations Convention on Psychotropic Substances and interviews with shamans in the Amazon."--Jacket.