This Jan. 26, 2013 photo shows a a bar code attached to the pots growing marijuana plants at a grow house in Denver. The bar codes are assigned to each plant and follow it through the

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This Jan. 26, 2013 photo shows a a bar code attached to the pots growing marijuana plants at a grow house in Denver. The bar codes are assigned to each plant and follow it through the growing and distribution process. Washington state is considering the use of a similar tracking system. (AP Photo/Ed Andrieski) less 

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Associated Press
Wed, Jan 30, 2013 1:03 AM EST