When running isn't an option, 'your best mode of defense is offense'

When running isn't an option, 'your best mode of defense is offense' »Play Video

The escalating number of mass shootings across the country has police agencies giving new advice to principals, teachers and students. Running and hiding are the best responses, but if those aren't options, your last resort is to fight back.

Click "play" on the video to see Patrick Preston's report.