As a teacher, mother of an elementary school student in Texas, and someone who once carried a gun for a living and has been trained in situational awareness and firearm tactics, no one perhaps is more prepared than I to carry a gun in my classroom. But I would never want to. ...most teachers are not trained in situational awareness. It is not hard to learn to shoot a gun; teachers could learn this with a few days of training. What takes far longer, however, is learning to respond properly to an active shooter. As a former staff operations officer...