It takes a thin ballistic film laminate over a door or window's ordinary glass to ... "This delays entry for any threat trying to come into a school, even if it’s not bullet resistant ...

of our entrance, we see a dark substance. This is what's called bullet wipe. As that bullet travels down a barrel, because it doesn't have any more residue to wipe off. With the exit, we can see ...

To do this, schools will have to install bullet-resistant glass or security film to all ... Some schools have more entry points than others, and others have a lot more windows on the ground ...