If I recall correctly what I read some years ago, LSD was developed by psychiatrists to treat certain mental illnesses. The early tests, conducted in the 50s, were considered clinically successful and written up in the journals. Ken Kesey was actually one of the test subjects. Back then, the stuff being so new, it was not illegal. The government probably didn't even know about it. Kesey ruined it for the docs by taking it outside the hospital and using it for play. That's what eventually got the stuff banned and all the trials stopped. A lot of the researchers were pissed off and thought that a promising treatment had been abused and then unfairly shut down. I think something like this account is given in Wolfe's Electric Koolaid Acid Test. The United States utilized LSD ostensibly for mind-control purposes in their Project MKULTRA during the '50s.