http://gizmodo.com/5553765/are-cameras-the-new-guns

"When the police act as though cameras were the equivalent of guns pointed at them, there is a sense in which they are correct. Cameras have become the most effective weapon that ordinary people have to protect against and to expose police abuse. And the police want it to stop. Judges, juries, and legislatures support the police overwhelmingly on this issue, with only a few cases where those accused of 'shooting' the cops being vindicated through the courts."