My highschool and middle school (same school) experience was all after columbine and shit heads had latched onto the incorrect idea that those guys were outcasts and part of some edgy group. Like in middle school some recent grad decided to just stand outside in a trenchcoat and gasmask. By college swatting and all that was a bigger thing. Saying the school is locked down is meaningless to me without more context.

Oh also we would lock down for so many things besides that. Anytime someone came off route two with cops in tow or anything happened on devens that's a lockdown. bear nearby? Soft lockdown.