Assault rifle bullets go through pretty much anything. They can easily punch through a human body, and still have more than enough energy to go through a wall and kill somebody on the other side. Of course, it's unlikely that the UW police know most of this. Police officers are often woefully ignorant of the weapons technology they spend so much time worrying about. If the UW police are really concerned about not feeling helpless, they should spend more time on the range and in simulation, and less time trying to achieve a techno fix by escalating an arms race.
Charter schools are businesses, plain and simple.
In the other drawings I also noted your accurate depiction of the various tools we use, and for that I owe you a debt of gratitude. That was not correct.