Arizona Republic:  “More than 2,300 Arizona residents have state permits to grow marijuana in their homes – for now. That will end in a few months when medical-marijuana dispensaries start opening and household gardeners must pull the plug on their grow lights or face criminal charges if they live within 25 miles of a dispensary.  But it’s unclear who will enforce the shutdown, and spokesmen for local law-enforcement agencies say they expect that will be a challenge.”