Staff from 10 community-based addiction treatment organizations in the National Drug Abuse Clinical Trials Network participated in an educational session about addiction research practices and human subject protections. This 1.5-hour presentation addressed "informed consent," "confidentiality of research information," "inclusion and exclusion criteria," "random assignment," "patient protections," and "patient payments." Pre- and postsession surveys were administered to 115 staff members measuring their beliefs about clinical trials. At baseline, 52% of staff believed patients could transfer out of a study even if they were doing poorly, and 55% believed staff had this right; 44% agreed that patients could participate in a clinical trial without understanding what would take place in the study. After the educational session, staff beliefs about patient protections were significantly increased in five of the seven items. A fourth of staff continued to believe patient payments were harmful, and 37% did not believe participation in a clinical trial would increase a patient's chances at recovery.