I don't think it can be done. Unless you are talking about things AI can handle; was it a first down, did it cross the goal line, how many Newtons were applied to his facemask (lol). As long as there is any subjective thing considered under replay, we will have missed calls, wrong calls, human error and controversy. That goes back to my thesis, replay hasn't solved anything, it's just moved them. Replay has obviously corrected calls, but it has not eliminated bad calls and controversy, so in my eyes it hasn't done anything other than detract from the entertainment value of the sport and slow it down.