@Possiblydrew it's a timer. If you need to go to the bathroom, the teacher approves 7 minutes. You have to be back on time. Anyone sees you in the hall you present it as a pass. The fact that the bathrooms may be locked and kids will need to wander across campus means nothing to them.
I've tried to teach my kids not to make my rebellious mistakes, but I may need to teach them some new tricks