Managing brats produced by dysfunctional parents these days needs large doses of locally administered "due process"...
All responsible parents agree.
Deal with it.
The proper Constitutional approach is simply to ban the use of cellphones on campus. Inconvenient to some, no doubt, but why not follow the Constitution instead of engaging in piecemeal and arbitrary abridgement?
Your argument is too close to ''the ends justify the means'' for my tastes, sorry.