It does, yes. Actually schools have several of them. What i said was a knee jerk reaction to "actively attempting to make it impossible to use cell phones in a school", because two obvious good use-cases of them are 'school shooting and reporting it instantly'; and 'my teacher just collapsed, help'. But yes, footwork could help fix a medical emergency (run to the nurse / another teacher); and chances are, someone heard a gunshot somewhere or someone can get to a place where they can report the shooting.