The early lsd researcher who was fired from his academic job, became a proponent of hallucinogenic drug use, and started a religion in which lsd was the sacrament is:

The answer is "Timothy Francis Leary".

Timothy Francis Leary was born in 1920 and was a psychologist as well as a writer from America. Concord Prison Experiment and Marsh Chapel Experiment were the result of experiments under the Harvard Psilocybin Project during American legality of LSD and psilocybin by him. He passed away in 1996.

they protect against unsafe foods and medicines being sold

explanation:

answer; no longer than a reasonable period of time;