The National Football League has been under extensive scrutiny for not preventing head injuries, that occurred on players which ultimately lead to death in many cases.

Chronic traumatic encephalopathy (CTE) is the term used to describe brain degeneration likely caused by multiple head traumas. CTE is a diagnosis made only at autopsy by studying sections of the brain.

A study in the Journal of the American Medical Association, found CTE in 99 percent of brains from NFL players, as well at 91 percent of college football players and 21 percent of high school football players.

CTE has forced the NFL and other football organizations to invest in new technology that will advance the equipment used in the game of football.