Police "get the message" via audio spotlight technology
Re: http://www.holosonics.com/
The quote below is from vigilante stalking/electronic harassment target Kelly Taylor, who lives in Utah, and who owns the "poor man's voice to skull device", meaning the Holosonics Inc. "audio spotlight." The audio spotlights can single out one target in a crowd at a moderate distance and feed audio to that person which, pretty well, only the target can hear.