you thought you were just kidding…just a few from quick search
https://www.vcstar.com/story/news/education/2018/08/27/ventura-county-how-make-school-student-safe-national-problem-gun-control/1086060002/
https://www.vcstar.com/story/news/local/2017/10/18/vegas-tragedy-shows-need-planned-active-shooter-drill/758373001/
https://www.youtube.com/watch?v=WPrTeuoEp0I
https://www.eventbrite.com/e/active-shooter-and-violence-prevention-seminar-ventura-ca-tickets-47876323372