Equipped with a highvoltage stunner, video camera, laser pointer and flashlight, the armor sleeve is intended to prevent violent situations. The invention was designed by David Brown, a cameraman, editor and producer who makes a living filming musical acts such as Rage Against the Machine and Snoop Dogg, as well as behindthe-scenes movie footage for the actor Kevin Costner, a friend and BodyGuard investor.

The BodyGuard debuted in May at the U.S. Department of Justice’s Mock Prison Riot, an annual training and technology-assessment event held at a decommissioned penitentiary in West Virginia. The first demo unit will be released to the Los Angeles sheriff’s department later this year. Brown says future incarnations could include chemical sensors, an electronic translator to help soldiers communicate overseas, or biometric readers for airport security guards. “BodyGuard will empower officers worldwide,” Brown says, “and it will save lives.”