Legal authorities gain when they receive deference and cooperation from the public. Considerable evidence suggests that the key factor shaping public behavior is the fairness of the processes legal authorities use when dealing with members of the public. This reaction occurs both during personal experiences with legal authorities and when community residents are making general evaluations of the law and of legal authorities. The strength and breadth of this influence suggests the value of an approach to regulation based upon sensitivity to public concerns about fairness in the exercise of legal authority. Such an approach leads to a number of suggestions about valuable police practices, as well as helping explain why improvements in the objective performance of the police and courts have not led to higher levels of public trust and confidence in those institutions.