Update: the teacher that sent him to the office now claims "no bags" is an unwritten rule that's been in effect for 10 years. The school now says he was suspended for cursing, which is not what they told the mother when the son was suspended. Updates
I'd love to know how this unwritten rule was put "in place" ten years ago. Presumably an announcement was made to the class of 2003, and it was passed down verbally to incoming freshmen.