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Nevada legislators are working to knock out head injuries among high school athletes. A Senate panel is taking up a bill Friday calling on school districts and the Nevada Interscholastic Activities Association to adopt policies on treating concussions. The policy would pull students out of games immediately after a head injury and only allow them to return once they are medically cleared. The National Centers for Disease Control and Prevention estimates as many as 3.8 million concussions happen each year in sports and recreational activities. People who continue playing with a concussion are more likely to suffer a catastrophic brain injury or death. The bill passed unanimously out of the Assembly last month. It now must work its way through the Senate.