BOSTON (CBS) – There is an unknown at the other end of every police encounter. A blind corner to round, a door to open, or a suspect to question. After viewing videos of police officers who were the victims of surprise attacks, former Green Beret, Robert Scali, developed Vector Shield. Vector Shield is just that: a lightweight shield that can be worn on an officer’s forearm and is impervious to most ammunition. “[It’s] designed to protect the hydraulics of the center line of an officer. And also, it’s designed to protect civilians because when the officer feels safe, they’re going...