Some of the numbers you're thinking of come from: https://techcrunch.com/2016/10/03/police-complaints-drop-93-percent-after-deploying-body-cameras/ https://tec

Some of the numbers you're thinking of come from: https://techcrunch.com/2016/10/03/police-complaints-drop-93-percent-after-deploying-body-cameras/ https://techcrunch.com/2016/10/03/police-complaints-drop-93-... Which also makes the point that the behavior sticks even when the cameras are gone. There was also another article a few weeks ago that made the point that the majority of police officers actually wanted the cameras back after the experiment ended.