In the 1950s, the CIA investigated LSD (lysergic acid diethylamide) as part of its Project MKUltra. Psychochemical warfare involves the use of psychopharmacological agents (mind-altering drugs or chemicals) with the intention of incapacitating an adversary through the temporary induction of hallucinations or delirium. It has been found to produce psychedelic-like effects, specifically the head-twitch response, in rodents with similar potency as 1P-LSD.
Does LSD Cause Long-Term Health Effects?
These guidelines are designed to maximize the chance of lasting positive benefits, and to minimize the chance of any offputting experience. You can find a list of legal psychedelic retreats and legal psychedelic therapy providers on TripSafe here. While not LSD, magic mushrooms are decently similar in effects and therapeutic potential to LSD.
Effects Of LSD

At first, everyone in Technical Services tried it; a typical experiment involved two people in a room where they observed each other for hours and took notes. Since he realized there was a difference in testing the drug in a laboratory and using it in clandestine operations, he initiated a series of experiments where LSD was given to people in "normal" settings without warning. Since its effects were temporary, he believed it could be given to high-ranking officials and in this way affect the course of important meetings, speeches, etc. The men were dosed with LSD, the brothels were equipped with one-way mirrors, and the sessions were filmed for later viewing and study. LSD and other drugs were often administered without the subject's knowledge or informed consent, a violation of the Nuremberg Code the U.S. had agreed to follow after World War II. Military personnel who received the mind-altering drugs were also threatened with courts-martial if they told anyone about the experiments.
Chemistry
In a modern study, the effects of the dose of LSD given lasted for up to 12 hours and were closely correlated with the concentrations of LSD present in circulation over time, with no acute tolerance observed. LSD also has an exceptionally long residence time when bound to serotonin receptors lasting hours, consistent with the long-lasting effects of LSD despite its relatively rapid clearance. LSD is approximately 200 times as potent as psilocybin and 5,000 times as potent as mescaline, meaning that it produces effects of similar magnitude at 1/200 and 1/5,000 times the respective doses.