Look at the results of marijuana legalization in other countries. Crime has decreased where marijuana is legal.
webmd.com/pain-management/news/20140326/medical-mariju...rime-rates-study
msnbc.com/all/does-marijuana-lower-the-crime-rate
huffingtonpost.com/2014/03/27/medical-marijuana-crime-...y_n_5044397.html
rt.com/usa/colorado-crime-change-legalization-study-017/
sciencedaily.com/releases/2014/03/140326182049.htm
rawstory.com/exclusives/amanda/legalizing_marijuana_vi...nt_crime_731.htm