I used to work at a school as an administrator and I can tell you these ridiculous situations are often the result of teachers and/or administrative staff who are bored with life and love drama. They get to get up on a soapbox and brag about how they just want to protect the children and have probably watched Bowling for Columbine far too many times. They are often propped up by equally nutty parents who are paranoid of just about everything. These types live in their own worlds however, and often fail to realize how the application of their policies might be perceived outside the school itself. I'm guessing there is a teacher and principal at the heart of this that is loving the attention.