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Nearly 95 percent of public schools had lockdown drills as of 2015-16.[1] I don't know anyone who's been through one either, but I'm an adult, and our generation just missed the cutoff.

[1] https://nces.ed.gov/pubs2017/2017122.pdf, quoted in https://medium.com/s/youthnow/the-response-to-school-shootin....

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I went through the public school system and I remember having lockdown drills from 1997 onward. Teachers just locked the doors and continued teaching until the all clear was announced and they unlocked the door.

In 2014 I was working IT for a private high school which had an active shooter drill on a yearly basis. I was told they started it two years prior because a student came onto campus with a handgun.

Both in southern California.

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