You should get a copy of "Ain't Nobody's Business If You Do: The Absurdity Of Consensual Crimes In A Free Society" by Peter Mcwilliams . Its an interesting read and even if you are already liberal minded about drugs it offers up some different views on the subject.

http://2020ok.com/books/41/ain-t-nobody-s-business-if-you-do-the-absurdity-of-consensual-crimes-in-a-free-society-10641.htm