The findings come amid what is known as the "psychedelic renaissance."
The bag—which has been dated to around 1,000 years ago—contains traces of several psychoactive substances.
Steve Hupp was a career criminal whose life was changed when a robbery went wrong and he found himself sharing a prison cell with a Peruvian shaman. Now, Hupp and his family have opened an Ayahuasca church deep in the Bible Belt of Kentucky.
Scientists would research it even more if the law would let them.
The natural, plant-based substance may be even more therapeutic than mushrooms and LSD.
Joshua Andrew Freeman Stevens says he visited the Peruvian retreat to seek treatment for a skin condition.
Psilocybin, LSD and other chemicals should be extensively studied, scientists say.
The substance, called harmine, helps regenerate pancreas cells.
Scientists and scholars discussed experiments with psychedelics drugs to treat anxiety, depression, addiction and other issues at a recent conference in New York City.