The U.S. government keeps the nation's largest legal marijuana stash on the campus of the University of Mississippi, where researchers test various strains of cannabis for potency. Double fences, locked doors and guard towers protect the cultivted marijuana plants inside from a world where marijuana is plentiful.<img src="http://feeds2.feedburner.com/~r/rss/cnn_crime/~4/uzaT8kZtrOE" height="1" width="1"/>
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