In this Feb. 7, 2014 photo, Elizabeth Burger, 4, holds her mother's hand at home in Colorado Springs, Colo. Elizabeth suffers from severe epilepsy and is receiving experimental treatment with a special strain of medical marijuana, which she takes orally as drops of oil. After years of nearly losing their daughter while trying and failing with dozens of mainstream treatments, Elizabeth's parents moved from the east coast to Colorado, where they say they have had luck with Charlotte's Web, a proprietary strain of medical marijuana in which the psychoactive THC has been largely bred out, and the other cannabinoid compounds thought to be medically useful accentuated. (AP Photo/Brennan Linsley)
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