Glenn Greenwald has a great paper about drug decriminalization in Portugal. Lots of shocking graphs and statistics. The digital version is legally available online for free.
http://www.cato.org/publications/white-paper/drug-decriminal...
http://object.cato.org/sites/cato.org/files/pubs/pdf/greenwa...
Unfortunately that's about the only resource I can think of when it comes to drug legalization/decriminalization in an actual real world environment. I'm hoping to see some papers in the next couple years about marijuana legalization in Washington and Colorado.
This is only semi-related, but Vangard has a really fascinating documentary on prescription drug abuse/doctor shopping in Florida you might find interesting. It's called the Oxycontin Express. Basically people go down to Florida, get a whole bunch of prescriptions for Oxycontin and then resell the pills in Kentucky and other States at a ridiculous profit. Here's a link to an online copy of it.