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Even if there are bullets that don't breech the hull, what happens when a shot is fired in a very enclosed space where there are lots of innocent people around? Riccochets? Bullets that pass thru the terrorist or another type of criminal?
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Innocent (collateral) casualties in such circumstances will be seen as unfortunate, perhaps unavoidable, but acceptable. Just hope it doesn't happen to you or a loved one.
There are various projectiles that do
should not richochet or go through the body, but will incapacitate, which is the objective.