Police department with too much power

I have a Police department who would fine our students for offences - shoes on inside; talking when they shouldn't be; wearing their hat; and a few other things. Some of my police - which changed every 5 weeks were very power hungry so i had to put a cap on maximum fines for a week. I am changing my police focus this term to "awarding bonuses on my guidance" instead of "fines". It just shows how some kids with too much power need guidance on the right way to use that power and not abuse that power!