Along with fire drills, schools have been conducting lock down drills -- often known as active shooter drills -- since the Columbine massacre in 1999. But safety officials do not agree yet on what teachers and students should do when a homicidal gunman invades their school.
Along with fire drills, schools have been conducting lock down drills -- often known as active shooter drills -- since the Columbine massacre in 1999. But safety officials do not agree yet on what teachers and students should do when a homicidal gunman invades their school.
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