Abstract: The problem of optimal public enforcement of law is examined in a model in which two types of enforcement effort are distinguished: specific enforcement effort, activity devoted to apprehending and penalizing individuals who have committed a single type of harmful act; and general enforcement effort, activity affecting the likelihood of apprehension of individuals who have committed any of a range of harmful acts. (A policeman on the beat, for instance, is able to apprehend many types of violators of law.) If all enforcement effort is specific, then under wide assumptions it is optimal for sanctions to be extreme for all acts. However, if all enforcement effort is general, optimal sanctions are low for acts of small harmfulness, increase with the degree of harmfulness, and reach the extreme only for the most harmful acts (the main result of the paper). Also considered is the assumption that enforcement effort may be both general and specific.