A majority of states now allow residents to use compounds from low-THC cannabis as medicine, but growing the plants remains a federal crime and in some states parents of epileptic children risk losing them by using the non-intoxicating treatment.

Republican members of Congress, inspired by stories from desperate parents who say use of low-THC, high-cannabidiol (CBD) cannabis saved their children, are taking the fight for legalization from statehouses to the U.S. Capitol.

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