She called for metal detectors at all doors and entrances of every dorm and every learning hall at colleges. Basically said since we were able to do it with airports and court houses, why not colleges. Her guest remarked, "Well in an ideal world we could"...to that effect.
so instead of the victims being inside a room, they can all be standing in a neat line in a hallway or doorway... much easier to hit your target that way...