DENVER, CO - APRIL 20: Javier Martinez of Denver, Co. uses a sign to advertise for LoHi Cannabis Club dispensary  as an estimated 10,000 people are expected to gather in Civic Center Park in Denver, Colorado on April 20, 2012 to celebrate the state's medicinal marijuana laws and collectively light up at 4:20pm. On Nov. 6, Colorado may become the first state to legalize marijuana with the passing of Amendment 64, a controversial ballot initiative that would permit up to 1 ounce of possession for those 21 and older. (Photo by Marc Piscotty/ © 2012)
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