entities that i knew to be untrue by the department. so it just motivated me to -- to want to speak out and get this thing out in the media because, of course, i couldn't speak to my chain of command. i couldn't speak to the guys who were in the department because in my eyes and on paper it seems that they were part of the coverup. >> reporter: cavalier claims he has documented proof that excessive force on black motorists goes far beyond the troopers involved in green's death. he alleges black troopers and the state police are disciplined more severely compared to their white colleagues. we took these claims to the louisiana stitt police who said it wouldn't comment about ongoing litigation. since coming forward, cavalier has received notice he is being fired from his job. >> the culture of the state police is systematically racist. it is a part of the culture. it is a part of the culture. you have to be there to understand it and explain it. i'm doing my best to expose the