Are marijuana growers sucking California dry?

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Thousands of marijuana farms are depleting California's streams at the height of a historic drought, according to state scientists. Special correspondent Spencer Michels follows along as game wardens, biologists and engineers go in search of marijuana on privately-owned lands -- not to eradicate the plants, but to see if growers are stealing and polluting water.

http://www.pbs.org/newshour/bb/marijuana-growers-sucking-california-dry/

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