. >> reporter: when seattle middle schooler zachary listead took this hard hit in the final minute ofol football game, his brain was already bleeding from a concussion. >> i was begging god to keep him alive. >> zachary was in a coma and then barely able to walk. that was four years ago. now he's been in intensive rehabilitation ever since. >> reporter: they don't know what i'm going to get back. >> reporter: in 2009, washington state passed zachary's law, which keeps a player with suspected concussion out of the game until a doctor approves. >> our delivery is to help the entire nation. >> reporter: now, congress is considering a federal standard. >> we're looking to change a culture. >> reporter: while zachary wasn't in washington, d.c., his message was. >> if you have like a headache or anything while you're playing a sport, tell someone about it. and don't go back into the game. because when in doubt, sit them out. >> reporter: zachary listead may never play sports again. but he is back on his feet. in los angeles, sandra hughes, wjz eyewitness news. >> and new at 5:00, more on ho