Researchers say 96% of former NFL players who donated their brains to science after death tested positive for a brain disease linked to concussions. CNN’s Sanjay Gupta explains.
Researchers: 96% of ex-NFL players had brain disease
Sep 21, 2015 | 3:41 PM
Now Playing
94.7 WLS | WLS-FM
Chicago, IL, USA
22 °F Overcast
