DEA Unearths Illegal Marijuana Operation in National Parks Marijuana is being grown illegally on national park land in seven states: California, Tennessee, Washington, Oregon, Kentucky, Hawaii and West Virginia, according to the Office of Drug Control Policy. The dealers hide the marijuana deep in the forest, on land often accessible only on foot. Across thousands of acres of national forest, dealers have painstakingly laid miles of elaborate waterlines through the forests to irrigate their crop. Each marijuana plant has been carefully positioned to receive its own water supply and maximum sunlight. This extensive cultivation operation produces massive marijuana plants, some 15 feet tall, sprouting buds the size of ears of corn. So far this season, the DEA has cut down more than 168,000 marijuana plants in California. And the growing season's not over yet....