Tough to impose a 'fine' on land you don't control, and we don't do anything like that. IF I have a real problem, my only real card is the extra DMAP permits, and the motivation to do the right thing.
Our baseline critera are - 8 points and ear tip spread. If a buck meets both critera (in our area) it will NOT be a yearling with 100% certainty. That said, as time progresses certain hunters have taken bucks that had less points, but if the jaw says they are 2 + then that's OK. We started with 6 points & spread, but we found that some yearlings met the 6 + spread criteria so we raised it.
The buck harvest guidelines should be set on biological criteria based upon your local yearlings.
My two cents.