Imagine a running back running through the line of scrimmage and, all of a sudden, a linebacker flashes through and lays a thunderous hit on the running back that knocks him down. He gets up, shakes his head and runs back to the huddle. Now imagine a referee going into the huddle and telling him that he is done playing for the rest of the game.
This is the situation that will now be happening in the California. The California High School football board has just made a rule that officials can now rule when players are not fit to play. I understand the reasons behind trying to do this, but ultimately, this isn't the job of the official.
When officials are trained, officials are not trained to be doctors. That's what trainers are there for. In no way are officials qualified to make that decision. If anything, they have enough on their hands during the game besides trying to pay attention to what every player looks like on the field.
Ultimately, I think that the issue should be taken up with the coaches of the teams and the trainers. If a coach sees someone looking like they are a little dinged up, then the coach should be able to pull him out and have the trainer take a look at him. Until their are doctors that are referees, there is no reason that a referee can tell a player he cannot get back in the game when the referee isn't even a qualified doctor.