NORML's white paper "Marijuana Decriminalization and Its Impact on Use: A Review of the Evidence", see http://www.norml.org/recreational/decrim.shtml.
June of 1998 Guardian/ICM opinion poll in the UK, see http://www.marijuananews.com/survey_shows_uk_public_backs_tre.htm
A 1999 Australian Study Showing that the Marijuana Laws are Not A Deterrent But They Often Wreck Lives, see http://www.marijuananews.com/australian_study_shows_marijuana.htm