Nationally, substance abuse surveillance networks have enabled communities to build an early warning network for emerging problems by tracking the types of drugs being used by age, location, race, and ethnicity; showing how substance abuse patterns are changing; developing better ways to deploy different kinds of prevention programs; and developing better ways to allocate scarce treatment resources. Generally, when agencies share information it increases cooperation across those agencies. By showing how substance abuse affects different parts of the Durham community, the report helped Durham agencies determine better ways to work together to address community problems.