Get an avatar Picaro .To what extent should schools limit 1st amendment rights? It's always been a controversial court subject, but I've yet to meet someone that is against it.
It should be non-existent during classroom time, limited to formal debates in civics, Speech, and/or philosophy classes, and by 'free' not 'free' as in 'Hey guys!!! Watch me do this nasty ass rap song bout rape and murder n stuff!!! Yuk Yuk!!!' but real speech about the chosen subjects. Otherwise keep your idiot kids' opinions to themselves.
If I can find a suitably annoying one, I will. The one I used at my last regular board would probably be banned here, as few people get the ironic symbolism unless they know some post -WW I pre-WW II Ihistory of American influence in Germany.