Several years ago(before it was against ToS) I scraped data from a county clerk website and did some mild analysis on it. I won't say what I was looking for, but I did find several correlations between case disposition (charges dropped, reduced, etc....) and certain combinations of judges/prosecutors/defense attorneys.

One particular combination showed a 10x increase in correlation with charges being significantly reduced or dropped.

It would be very interesting to see a proper dataset and analysis on this type of information.