Video Duration 02 minutes 27 seconds

Brain damage found in 99 percent of deceased NFL players’ brains

New research has confirmed the devastating effect on the brain for many who play America’s number-one sport.

New research has confirmed the devastating effect on the brain for many who play America’s number-one sport.

Post-mortem examinations of more than 200 former NFL players found that nearly 99 percent revealed signs of a disease linked with repeated blows to the head.

Al Jazeera’s Mike Hanna reports from New York.