League of Denial: The NFL, Concussions and the Battle for Truth by Mark Fainaru-Wada and Steve Fainaru:
“This 6-year study indicates that no NFL player experienced . . . cumulative chronic encephalopathy [brain damage] from repeat concussions. While the study did not follow players who left the NFL, the experience of the authors is that no NFL player has experienced these injuries.”
The NFL hadn’t actually studied retired players, but that didn’t stop the league’s experts from concluding that none had sustained long-term brain damage. Pellman and his colleagues would repeat this statement, in some form, over and over and over.
Except that not even the NFL believed it to be true.