When a shooter approaches a school, locked doors do little good when the entrances are all glass with no protection. Here are a couple of photos of Sandy Hook showing where the shooter entered the building - it was next to the entrance. Why? Because it was easier to walk through.
If schools used it on all their glass they would also be saving energy and cutting operating costs - enough to pay for the film over time! They would also be protected during storms throwing wind-borne debris into the glass, such as hurricanes and tornadoes or hail.
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