Discover the strategies that the National Football League used to avoid admitting that playing professional football can cause chronic traumatic encephalopathy, or CTE, in this media gallery from FRONTLINE: League of Denial. After a study commissioned by the NFL showed a higher-than-expected prevalence of brain disorders among football players, the league’s spokesman claimed that the study’s design was flawed, and its commissioner would not acknowledge before Congress that concussions hurt pro football players. And even after a large financial settlement awarded former NFL players hundreds of millions of dollars, the league made no admission of guilt. For background, watch Introduction to CTE and review How CTE Affects the Brain. This resource is part of the FRONTLINE Collection.