I cant really think of anything that would prevent something like this from happening. The impact could be minimized if there was a proper system in place for in the event when this does happen. Perhaps this event will make the school district more aware of this real threat. If they have a fire alarm for fires to instantly alert everyone why cant they have a second alarm for something like this.
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"A power nap is when you sleep on someone who is weaker than you." - Dimitri Martin
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