Acoustic Warfare Protesters

In this Thursday Sept. 24, 2009, photo, a Long-Range Acoustic Device is seen mounted atop a law enforcement vehicle on the streets of Pittsburgh during the G-20 Summit. Police dispersed protesters at the Group of 20 summit last week with a Long-Range Acoustic Device that emits a beam of earsplitting alarm tones that the manufacturer likens to a “spotlight of sound,” but that legal groups called potentially dangerous. (AP Photo/Matt Rourke)

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