One of the biggest social and cultural movements currently sweeping the civilized world is what’s being called the “Psychedelic Renaissance.” That is the name for today’s wildfire-like reemergence, in mainstream culture, science, and medicine, of psychedelic drugs such as LSD, psilocybin, and MDMA, which were outlawed in in the late 1960s, 1970s, and 1980s, respectively. Less than a decade ago, these substances—listed by the Drug Enforcement Administration (DEA) as Schedule I drugs—were almost completely prohibited for all recreational, research, and medical uses. Possession of them was as...