The Effect of Medical Marijuana Laws on Crime: Evidence from State Panel Data, 1990-2006 Morris, Robert G. ; TenEyck, Michael ; Barnes, J. C. ; Kovandzic, Tomislav V. Abstract Publication: PLoS ONE Pub Date: March 2014 DOI: 10.1371/journal.pone.0092816 Bibcode: 2014PLoSO...992816M