[ The folly ]( http://karenfraid.tumblr.com/post/42953390104/permanent-lockdown-and-the-ethics-of-lying-to-children ) of repeated "lockdown" drills in US schools.
Ссылка: https://stallman.org/archives/2014-jul-oct.html#22_September_2014_%28Folly_of_school_lockdown_drills%29