This is an excellent episode. The story of Adrian Schoolcraft is a great example of how data, when used to irresponsibly set quotas, can be abused.
But many of the things that affect the final outcome may not be particularly measurable. Without expert knowledge of law enforcement I think that may be the problem with evaluating police officers' work. For example, conversations with citizens may prove to aid crime reduction and confidence in the police, but how do you quantify them in terms of nature and value?