Four years after a gunman claimed the life of 20 children and six adults, three Detroit-area dads have developed a system to help keep children safe if an intruder threatens their safety at school.

Ben Powers, Pete Racite, and Jeff Thompsoon developed the system which includes a bullet-proof vest equipped with implements to fight off a gunman. School personnel would be required to go through a training program in order to access the equipment.

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