Let's see, what's the most successful gun free zone? on an airplane, why? because there are sufficient level of security screening.
Are you suggesting to screen kids on the school like they screen passengers on airports?
Yes, I'm saying if you make a place a "gun free zone", then you better implement airport level security, otherwise, you can't make it a "gun free zone", you are simply putting people in danger, basically you are putting up a sign that says "Everyone at this place is unarmed".