Should states test marijuana for potency, purity and safety?

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Marijuana Testing
FILE - This Jan. 4, 2013 file photo shows a lab technician preparing a sample of marijuana for testing at CannLabs in Denver. With Oregon, Washington and Colorado all making pot more widely available to the public, testing for safety, purity, potency and active ingredients is adding to the legitimacy of a drug once on the outlaw fringes of society. (AP Photo/Ed Andrieski, File)