program judge?

hey guys i was thinking how crazy it would be if there was a program judge to which you submitted all evidence data, testimonies, etc and it came up with a veredict and sentence if there is any
-no more briberies, all criminals would get it
-it can be refined to get the fairest judgements, a real science could come up from that
-it doesnt need to have AI, just a function that takes input and produces decisions, no fear of robot overlords

The real question, if we determine judge and jury can be adequately simulated by a finite state machine, is who would you trust to define the states that go directly to jail?