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The answer to propping doors is having an alarm if the door is open for too long. We had these at my last place of employment- key swipe to get in and then an alarm if it was open too long. It was interesting when we were all returning from a staff meeting in a conference room on another floor or if a large group went to lunch together and all came back. The first person would swipe and then people would try to follow very quickly to avoid the alarm!
Fire escapes are another area to be concerned. I know of at least one incident where an intruder came in from the fire escape to an un-alarmed window on the third floor. Don't forget to alarm those fire escape windows/doors also.
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