For all the misguided social media chatter about arming teachers with firearms, a more effective deterrent is ensuring school doors are locked.
Reports in the wake of the tragedy at Robb Elementary School in Uvalde, Texas, underscore the need for vigilance regarding such mundane policies. The gunman entered through a back door before killing 19 students and two teachers. Texas state police initially reported a teacher propped the door open with a rock while carrying food from a vehicle. It was subsequently revealed the teacher closed the door when she realized the shooter was nearby, but it failed to lock.