In our school should be included in the camera and bars with a metal detector;) as at airports. With Door could find a security guard watching would not come no one "needed" to our school.
I believe a safe school should first of all be established in a safe part of town. It must be backed up by CCTV cameras for maximum safety. Some security personnel may also be hired by the school for a better safety in the vicinity.

To chyba na tyle:)