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There are other things they fix as well, such as complaints against officers: http://sanfrancisco.cbslocal.com/2016/09/29/study-finds-body-cameras-reduce-police

• vkou 10y ago
  That study is... Contentious, even among technophiles, as per the previous HN discussion thread on it. The most important thing that body cameras 'fix', is giving the public the perception that the police are doing 'something' to solve the problem. (Now that we've done something, can everyone be quiet, and go back to work?) This is why police departments tolerate the idea of body cameras. It gives them more budget, and the impression of accountability - all the while, without having to do anything to change cop culture. Cops know that no amount of video evidence will overpower the testimony of a reliable, professional eyewitness - themselves.