Penn-Trafford High School athletic trainer Larry Cooper, left, puts Roman Orange, a senior on the wrestling team, through concussion evaluation testing at the school in Harrison City, Pa., on Thursday, Jan. 22, 2015. Backed by the NFL, every state in the country has passed a law to protect young athletes from concussions. However, fewer than half contain the four key principles, which are considered the ìgold standardî for concussion law. KEITH SRAKOCIC/AP PHOTO