How will Washington keep weed from crossing the border?

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Legalizing Marijuana
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Legalizing Marijuana
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)