Rep. Louis Lang, D-Skokie speaks prior to a bill signing for medical marijuana at the University of Chicago Center for Care and Discovery in Chicago, Thursday, Aug. 1, 2013. The measure

 

              Rep. Louis Lang, D-Skokie speaks prior to a bill signing for medical marijuana at the University of Chicago Center for Care and Discovery in Chicago, Thursday, Aug. 1, 2013. The measure
Rep. Louis Lang, D-Skokie speaks prior to a bill signing for medical marijuana at the University of Chicago Center for Care and Discovery in Chicago, Thursday, Aug. 1, 2013. The measure outlines a four-year pilot program that requires patients and caregivers to undergo background checks and sets provisions for state-regulated dispensaries. (AP Photo/Scott Eisen)