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How to spot the warning signs of a potential mass shooter

04:30

Following Monday’s deadly mass shooting at a school in Nashville, safety and security on campus is becoming top of mind for many parents, teachers and students. Author of “Stop the Killing: How to End the Mass Shooting Crisis” and former FBI agent executive, Katherine Schweit, joins News NOW to share how to spot the early warning signs that could help prevent mass shootings and potentially save lives.