Well I can easily answer 2 of those.
The armed resource officer at Columbine was in a different building, which just goes to show how difficult it would be for one person to cover an entire school.
At Fort Hood, military personal are not allowed to carry on base, so the shooter basically attacked a gun free zone. Virginia Tech is also a great example of why MORE cops at schools wouldn't exactly solve the problem entire.
But then again, I read today that 40% of schools in the US have a police officer on premises at LEAST one hour per day, so who knows what will happen now.
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