TB: xtra secureschool is easier than banning guns. Pre-ID shooters: maybe?

There are three things you can do to stop a mass shooting, CNN's John Sutter says. You can find the gun, figure out who the shooter is before he or she does it and secure locations. He agrees that putting more defense into schools would be "sensible," but not federal law. The other options are really difficult, finding the shooter, finding the gun,. Sutter writes.