Nobody needs a quiz. People should generally know how to act in a freaking civilized manner. When someone breaks a rule that should not be zero tolerance, warn them ONCE, after that ban them permenantly. I say implement a Zero Tolerance rule for certain subjects, and stick to it. Even if the top member breaks it, ban.
Gotta be harsh for people to behave I guess.
This is just my own opinion. Take it as you will, and I hope this is helpful input.