The document describes Project SPARC, which provided substance abuse, HIV, and hepatitis prevention education to people involved in the criminal justice system for drug-related crimes. It administered knowledge tests before and after delivering its curriculum via five 2-hour classes or a single 2-hour brief session. Test scores increased significantly from pre- to post-intervention, indicating the program effectively improved knowledge of HIV/AIDS and hepatitis transmission and prevention. The results suggest both curriculum formats were effective for the target populations.