Upon further reading the Huffington Post tries to show both sides of the story. However in their attempt to show the school's side I have an even bigger issue.
Parents aren't allowed in the school because the PTA was fearful for child safety. So they instituted the new pickup rules and guidelines which aren't legally binding.
You can't arrest someone for violating your non-legal rules. That's like me arresting you for wearing a Canucks jersey on my property.
Edit: forgot the link
http://m.huffpost.com/us/entry/4310672