Army Ranger Justin Slaby served two tours in Iraq and one in Afghanistan. While he was back in the U.S. preparing to deploy for a fourth tour, his left hand was blown off by a faulty grenade in a training accident. After being fitted with a state-of-the-art prosthesis, Slaby was encouraged by one of his doctors to try for a career in the FBI. What happened next has landed the ex-Ranger and the FBI in court and already tarnished the career of a high-ranking agent.