You have never heard of only 3 coaches in the box? That is in the rule book as well. I agree that 95% of the time it is not enforced, but I know that this is a point of emphasis this season, or is supposed to be a point of emphasis, in the state. How do I know? I am also a head linesman. And for never seeing it, you should go to Cleveland High School and watch the Cleveland team. They rarely have more than 3 coaches in the box and I never saw a player in the box the whole night. Again, that is a rule, only 3 coaches in the box.