I'm commenting based on my experience. I wasn't at Columbine. What we won't ever know is how many shootings were averted by the knowledge that a security person would be on duty.
Dave
Your experience is that one school had an officer and there were no attacks. The nations experience has been vastly different. I have a 4 y.o. in school. I do NOT want an armed officer outside of her door... or on the grounds. Can we please find another way to address this besides more guns at our schools?