Both of these sites have an incredible amount of Dept. of Justice criminal justice statistics

This site provides fascinating graphs and charts about the relative harms of various drugs and how much money the federal government spends on the Drug War.

a comprehensive series of factoids about the ‘war on drugs’ published by a pro-law reform organization. Also includes "recent news" section with articles about pending cases.

All you ever anted to know about the history of hemp and more.

Licit and Illicit Drugs by Brecher: An extensive history of popular drug usage and effects, written by the editor of Consumer Reports Magazine. 1972.

National Academy of Science report on Cannabis (1982), a comprehensive government funded study examining all, then, known aspects of cannabis and it’s effects on the human body.