Parents Buy Bulletproof Backpack Shields to Protect Kids From School Shooters

Yep. Terribly unsafe things, there's a real chance someone might use it to do something horrible.

the kinetic trauma is difficult to deal with, and not a lot can be done about that with so called hi power rifles.

ricochet is a problem for design. a round can ricochet the surface of the plate redirect and exit the edge striking upperlimbs, or head/neck area. this is mostly a consequence of hit from front. rear not so much but hitting someone nearby is very possible.