A New Orleans physician provided the skulls of the 19 people to a German researcher engaged phrenological studies — the debunked belief that a person's skull could determine innate racial characteristics.
Affinity graduations recognize the range “of challenges and obstacles" that students from minority backgrounds face as they work toward their degrees, said one professor.
The league said its investigation included gathering information from fans, team and arena staff members, as well as an "audio and video review of the game."
Marines and airmen with pseudofolliculitis barbae, the skin condition more commonly known as razor bumps, could be expelled from the service if the condition persists.