Any logical person would conclude from this data that the officers were knowingly using force inappropriately before the cameras were used.
Or, any logical person might also conclude that the use of force was previously quite low, and that the 60% reduction in force falls within the standard deviation.
Also, the fact that the actual numbers are not reported, and the actual episodes are not described, should make a logical person suspicious.
Also, the fact that perps know they are being taped may change perp behavior, too.
Also, complaints to the Police Department may decline when residents can watch a video of the actual episode on their local news channel.