THERE IS NO WALL. When will the simple meaning of the 1st Amendment be set aright. There is no wall. It doesn't say it and it doesn't mean it. It's not there. Do yourself a favor and read this article.
http://www.noapathy.org/tracts/mythofseparation.html
When the students start exercising their first amendment rights. They can make all the rules they want. The students don't have to follow them.