In one study, two-thirds of the alcoholics stopped drinking for at least 18 months after receiving one dose of LSD, compared to 25 per cent who stopped after group therapy and 12 per cent after individual therapy.
But the 1962 study was received with scepticism by a research group in Toronto. They repeated the study on blindfolded patients in isolation, and concluded that, under these conditions, LSD was not an effective treatment for alcoholism.
Writing in the journal Social History of Medicine, Dr Dyck said: "The LSD experience appeared to allow the patients to go through a spiritual journey that ultimately empowered them to heal themselves, and that's really quite an amazing therapy regimen. We accept all sorts of drugs, but I think LSD's 'street' popularity ultimately led to its demise. That's too bad because I think the researchers in Saskatchewan, among others, showed the drug is unique and has some intriguing properties that need to be explored further."
I'm not sure how you would control for LSD. The effects of LSD are so strong that you would know for certain that you were in the experimental group, regardless of whether you were blindfolded or not.