I would say that the Siler Commission, Panama Canal Zone Report of 1930, for example, stating that "cannabis use was harmless, and, having subjected to medico-scientific clinical monitoring, heavy cannabis smoking produced no effect upon motivation or performance", would qualify as an answer to your question.
Half an answer ... what's the contrary new fact?
295 posted on 04/02/2006 2:08:40 PM PDT by Know your rights
(The modern enlightened liberal doesn't care what you believe as long as you don't really believe it.)