A university professor says in a federal lawsuit against the Pittsburgh police that her hearing was damaged when officers used a giant speaker to disperse protesters during the Group of 20 economic summit two years ago, the Associated Press reports. The American Civil Liberties Union is representing Karen Piper, then a visiting professor at Carnegie Mellon University. The lawsuit says Piper was a bystander when protests occurred near the university on Sept. 24, 2009…

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