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The United States federal government considers marijuana an illegal drug. But almost half of the 50 U.S. states have made marijuana use legal or only a minor crime. People who support legalization of marijuana say some kinds of the plant offer extraordinary help for human health. For example, one kind of medical marijuana is reported to ease effects of epilepsy, a disease of the nervous system. Maggie Selmeski is two years old. She has spent much of her life in the hospital. Maggie has a rare form of epilepsy. The condition can cause a sudden loss of consciousness. It also can produce repeated seizures, periods of uncontrolled shaking. Maggie’s parents are Rachel and Shawn Semelski. They say they made emergency trips to the hospital many times in the first year of Maggie’s life. Doctors used medicines to save her life. But Mr. Selmeski says the drugs also had other unwanted effects. The couple then learned about medicinal marijuana called Charlotte’s Web. It was developed in Colorado where the drug is legal. The Semelskis lived in Tennessee where it is not. Maggie’s doctors could not legally treat her with marijuana. So the Selmeskis moved to Colorado. They have treated Maggie with Charlotte’s Web three times a day for the last year. The Semelskis say her condition improved immediately. They say her digestion and muscle mass improved. And they say she began to smile more. About two hundred families have moved to Colorado in order to treat their epileptic children with Charlotte’s Web.