That's an easy one. The rules state that the helmet must have a four point chin strap and that all four points must be connected. The rules say nothing about the helmet fitting correctly nor do they say anything about the chinstraps actually holding on to the chin.
Most of the players keep the chinstraps so loose that the chinstrap rests closer to the neck than the chin. They also like to keep the helmet loose so that it is easy to take off. Most programs don't take the time to fit the players properly nor are they pushed to. I think this needs to be a point of emphasis for the coaches because an improperly fitted helmet is almost as bad as no helmet at all. Additionally, if it is not fitted correctly it will not absorb an impact correctly which could lead to more brain injuries.
I have no study to back this up, just my observation as a player for 10 years and an official for another 10.
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