Do schools need armed guards and bulletproof glass? Students fret about 'lockdown culture'

How well-fortified do Minnesota’s more than 2,000 public school buildings need to be?

Should they all have armed guards? Locked entrances with bulletproof glass? Teachers with weapons and tactical training to intercept a violent intruder?

https://www.twincities.com/2018/03/11/mn-legislature-school-security-is-there-such-thing-as-too-much/