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Uploaded on May 2, 2011
Professor sues Pittsburgh for using sonic device at G-20 protest http://www.rawstory.com/rs/2011/09/22... Karen Piper, then a visiting professor at Carnegie Mellon University suffered permanent hearing loss after Pittsburgh police deployed a Long Range Acoustic Device (LRAD) against protestors during the 2009 G-20 Summit has filed a federal lawsuit against the city. The device emits pain-inducing sounds to disperse crowds and is also deployed on American warships.