A study from Cambridge University documents an immense drop in complaints against police officers when their departments began using body cameras. But even more surprising is that the data suggests everyone is on their best behavior whether the cameras are present or not. The data was collected in seven police departments in the UK and US, and represents over 1.4 million hours logged by 1,847 officers in 2014 and 2015
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In the year before the study, 1,539 complaints in total were filed against officers; at the end of the body camera experiment, the year had only yielded 113 complaints
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Against all expectations, there was no significant difference in complaints between officers wearing cameras that week and those going without.

Source: Police complaints drop 93 percent after deploying body cameras | TechCrunch