In that same 20 year time period, U.S prison population tripled

http://www.mega.nu:8080/ampp/elkhorn/elkhorn.html
The real reason the Government won’t debate Medical Cannabis and Industrial Hemp Re-legalization. An open letter to All Americans. Documented evidence of a secret business and political alliance between the U.S. “Establishment” and the Nazis- Before, During and After World War II- up to the present. Written July 4 ,1996 by R. William Davis. Arguments for prohibition include physical and mental health for the user and damage for non users, the increased concentration of THC in marijuana, more accidents, more risky behavior, public order grounds, the gateway drug argument, increased cost for public health and treatment of addicts, loss of manpower, loss of tax income and purely political grounds such as vote catching and simple dislike of the drug culture