I doubt that many adults would consent to opening the door on a minor. I believe that yes they may have had a problem in the past with this transgender student using their preferred restroom but I doubt there go to is “open the door and catch them in the act” I’m sure this is a completely separate incident... the minor may have been doing other things like ditching class and locking themselves in that stall. We constantly complain about minors not being disciplined enough but when someone finally does it turns into a social issue but guess what! All kids of all backgrounds are capable of being defiant and breaking rules and not respecting authorities and teachers.