Did Football Kill Former Eagles DB Andre Waters?

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I think todays NFL pays allot more attention to head injuries than they did in the past and with findings like these it gives them even more reasons to protect the players. I do give the NFL and teams credit for how they treat these concusions now verse back in the days when they did not know how they could effect a player. VT players played a few games in the past with these sensors in their helments to see how big of an impact that they really where taking. The findings (if I'm correct) showed that there was less impact than at first thought and they gave the credit to new tech. in equipment. Maybe others remember moere about the test they ran.