The next generation of school shooters grew up doing active-shooter drills — and know how to get around them, experts say

The next generation of school shooters are so young they grew up doing active-shooter drills — and therefore know how to get around them, experts told Insider.

These drills, which are currently implemented in around 95% of America's public schools, are meant to prepare staff and students in the event of an armed intruder or active shooter on campus.

They range from training students and staff to barricade classroom doors and hide in the corner, to high-intensity simulations with actors pretending to be gunmen and shooting at teachers with plastic pellets.