Rick Strassman and the DMT Trials
Conducted at a US university between 1990 and 1995, the study recorded volunteers' vivid reports of encountering apparently intelligent entities during the drug's effects — recorded carefully as clinical data, without the research itself endorsing any claim about what the entities actually were.
Rick Strassman, DMT: The Spirit Molecule (2000), recording the University of New Mexico trials (1990–1995)
American psychiatrist who ran the first US government-approved human psychedelic research in two decades, giving hundreds of DMT doses to volunteers.