In this Jan. 26, 2013 photo a worker at a grow house in Denver examines a marijuana plant ready to be harvested. Last fall, voters made Washington and Colorado the first states to pass

 

              In this Jan. 26, 2013 photo a worker at a grow house in Denver examines a marijuana plant ready to be harvested. Last fall, voters made Washington and Colorado the first states to pass
In this Jan. 26, 2013 photo a worker at a grow house in Denver examines a marijuana plant ready to be harvested. Last fall, voters made Washington and Colorado the first states to pass laws legalizing the recreational use of marijuana and setting up systems of state-licensed growers, processors and retail stores where adults over 21 can walk in and buy up to an ounce of heavily taxed cannabis. Both states are working to develop rules for the emerging recreational pot industry, with sales set to begin later this year.(AP Photo/Ed Andrieski)