The research isn’t sure
If you want a teacher's perspective on this: https://www.edsurge.com/news/2023-05-10-i-am-tired-of-being-silent-about-gun-violence-in-schools-here-s-how-we-can-take-action
If you want a teacher's perspective on this: https://www.edsurge.com/news/2023-05-10-i-am-tired-of-being-silent-about-gun-violence-in-schools-here-s-how-we-can-take-action