"Extra" meaning "against NCAA rules"???? That's a statement no one can definitively say.
Are all humans generally prone to being tempted to cheat?? Absolutely!
Does it mean that everyone in football WILL cheat if he thinks he can avoid detection???
I'm not willing to go there. Just because everyone is tempted doesn't mean that you cannot trust anyone.
About 40 years ago I read an article on morality on the university campus. The article started out with this line that I have never forgotten: At UCLA, students are taught that people are basically good, but they have electronic detectors in the library to keep people from stealing books; 30 miles away, at Biola University, students are taught that man is basically evil, but they have no electronic detectors in the library.