This Jan. 26, 2013 photo shows bar codes attached containers of processed marijuana 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)

Associated Press
This Jan. 26, 2013 photo shows bar codes attached containers of processed marijuana 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)
This Jan. 26, 2013 photo shows bar codes attached containers of processed marijuana 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)
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