https://trustychucks.com/what-a-lockdown-drill-feels-like/
What a lockdown drill feels like
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https://www.sevakeducationtrust.org/document/lockdown-drill-letter/
Lockdown Drill Letter - Seva School
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https://www.10news.com/news/san-diego-police-arrest-chula-vista-students-during-lockdown-drill
SDPD arrest Chula Vista students during lockdown drill
Dec 7, 2018 - Four students at Montgomery High School were arrested Halloween Day during a state-mandated lockdown drill at school.
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https://journal.unknownlamer.org/archives/16500
Lockdown drill nightmares Richard Stallman’s Political Notes – The Death of the Mind
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