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

 

              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
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)