The Judges themselves are not exempt from the law; in fact they are expected to obey it more strictly than any other. A violation that would earn a citizen a few months in an Iso-Cube would get a Judge a twenty-year sentence, served as hard labor on Saturn's moon, Titan, after surgical modification to enable the convict to survive outside without needing an expensive space suit. (Titan is a moon of Saturn in reality, but was located over Jupiter in an early Dredd strip.) When Judges do make a minor mistake (anything where the citizen is alive and not in an intensive care ward) such as wrongful arrest or search they do have to pay the citizen a compensation fee if there is no crimes to be charged with. On that basis, if they can't find any evidence for the main charge, then they will look for any minor crime or misdemeanours to charge to citizen with to get themselves off the hook.