School boards with zero tolerance policies need to be replaced. If you are unable or unwilling to make, and stand by, a ruling on each incident, then you are not fit to sit on any such board.
Refer them to any number of sites that have the law posted and read (if they can) for themselves. It is a very easy to read law. Then they, and all the other Dem's,can sit in the corner and find something else to crab about.