critical condition. there is usually an armed police officer at the school. but he was not there today. the gunman was stopped by a teacher and another adult, who talked him into giving up his weapon. the shooter is in police custody. the storm of gun violence in our schools across the country has opened up a pandora's box. one of the most controversial proposals is to put more guns in schools. and put them in the hands of teachers. it's not a popular idea nationwide. 64% of americans oppose arming our school teachers. but those who support the idea of making their voices heard. last night we spoke with caroline kane, a special education teacher from utah who was training to use a firearm, which she plans to carry into her classroom. >> it's not so much i want to carry a gun. i want to have options for that situation. i think the world is changing. it's not safe. and we see these kinds of situations happen over and over.