From The Economist:
A paper in the Proceedings of the National Academy of Sciences describes how Shai Danziger of Ben-Gurion University of the Negev and his colleagues followed eight Israeli judges for ten months as they ruled on over 1,000 applications made by prisoners to parole boards. The plaintiffs were asking either to be allowed out on parole or to have the conditions of their incarceration changed. The team found that, at the start of the day, the judges granted around two-thirds of the applications before them. As the hours passed, that number fell sharply (see chart), eventually reaching zero. But clemency returned after each of two daily breaks, during which the judges retired for food. The approval rate shot back up to near its original value, before falling again as the day wore on. ...
The researchers offer two hypotheses for this rise in grumpiness. One is that blood-sugar level is the crucial variable. This, though, predicts that the precise amount of time since the judge last ate will be what matters. In fact, it is the number of cases he has heard since his last break, not the number of hours he has been sitting, which best matches the data. That is consistent with a second theory, familiar from other studies, that decision making is mentally taxing and that, if forced to keep deciding things, people get tired and start looking for easy answers. In this case, the easy answer is to maintain the status quo by denying the prisoner’s request.
Disturbing, don't you think? We like to think our system of justice is fairer than this. Yeah, you may not worry much about criminals. But it'll be too late to worry about fairness if you ever find yourself in this situation.
Our legal system needs to be fair to everyone, no matter who they are, because otherwise, it will be fair to no one.