Interesting look at the role of racism in drug prohibition.
Debunking the Hemp Conspiracy Theory | DrugReporter | AlterNet
Similar material in the following book chartered by President Nixon's research committee (just before he ignored the committee findings and started the "War on Drugs").
Amazon.com: The Marijuana Conviction: A History of Marijuana Prohibition in the United States (Drug Policy Classic Reprint from the Lindesmith Center): Richard J. Bonnie, Charles H. Whitebread:
Then Came Nixon
3 hours ago