In this Oct. 3, 2012 file photo, marijuana plants are seen in Chicago where officers say they discovered two football fields worth of pot plants growing on the city's South Side. (AP Photo/Teresa Crawford, File)
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In this Oct. 3, 2012 file photo, marijuana plants are seen in Chicago where officers say they discovered two football fields worth of pot plants growing on the city's South Side. (AP Photo/Teresa Crawford, File)
