Several police departments across America are planning to try a new device that uses focused sound, turned way up. These so-called non-lethal... Focused Sound 'Laser' for Crowd Control Crowd control ...

During protests in the USA, security authorities use LRAD systems for announcements and crowd control. How do these "sound cannons" work?

On a suburban street in Maple Grove, a device first built for battlefields and warships was pointed at a crowd of Minnesota protesters. The long-range acoustic system, sometimes described by critics ...

Crowd control is a constant challenge to law enforcement -- how to stop potential troublemakers without endangering those who are simply in the wrong place at the wrong time. Rubber bullets can kill, ...