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Mike webster in 2005. but the first public acknowledgement from the nfl on the risk of brain disease for players didn't come until a 2016 congressional hearing. >> the research shows that a number of retired nfl players were diagnosed with cte, so, the answer to that question is certainly yes. >> reporter: in the following years, the nfl did implement concussion protocols. those protocols still evolving. this season, when miami dolphins quarterback tua tagovailoa suffered this hit, it knocked him unconscious with his hands frozen. he was eventually carted off the field. in the following weeks,...

>> the latest figures from boston university show nearly 92% of former nfl players they studied were diagnosed with cte, with symptoms including depression, impaired judgment, violence, dementia and suicidal thoughts. >> it's a problem for current players, it's a problem for players who have retired, and it's not going away. >> reporter: former nfl player phillip adams had stage two cte when he went on a rampage that killed six people before he took his own life in 2021. >> he's a good kid. he was a good kid and he -- i think the football messed him up. >> reporter: dr. anne mckey is the direc...