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Medical marijuana got a huge boost on Tuesday when the American Medical Association—the nation's largest physicians' organization—urged the federal government to loosen the classification of marijuana, which is currently a Schedule I controlled substance. Other drugs classed as Schedule I, the most restrictive of the federal government's five schedules, include heroin and LSD. The AMA's goal in changing its policy is to clear the way for clinical research, development of marijuana-based medicines, and creation of alternate ways to deliver the drug.