You get buzzed in the exterior door after stating your business and showing ID on CCT. Then you are let in an enclosed area, still locked out by a second set of doors. No access to the school yet. You talk to the office through glass. At that time you sign in, show ID, and given a pass to enter the school. Also, most schools in my area do have active shooter drills along with fire and tornado drills. It's not perfect but it's really good. Some high schools have metal detectors and all have resource officers.