Lockdown drills are increasingly common in classrooms across the United States, with 95.7 percent of public schools reporting that they practiced a lockdown drill with their students during the 2017–2018 school year.
Lockdown drills are increasingly common in classrooms across the United States, with 95.7 percent of public schools reporting that they practiced a lockdown drill with their students during the 2017–2018 school year.