In 2012, Washington state voters passed Initiative 502 (I-502), which removed the prohibition on the production, distribution, and possession of marijuana for nonmedical purposes and required the state to regulate and tax a new marijuana industry. Legaliz
Beau Kilmer,Jonathan P. Caulkins,Gregory Midgette,et al. Before the Grand Opening: Measuring Washington State's Marijuana Market in the Last Year Before Legalized Commercial Sales. 2013-01-01.