Long before the reefer madness hysteria of the 1930s, W. B. O'Shaughnessy brought Cannabis (aka "Indian Hemp") into Western medicine. It was featured in the United States Pharmacopoeia from then up until Anslinger's time. The "science" behind its removal from the U.S.P.? Put Anslinger+jazz+swing or "White men's shadows" into your search engine of choice...