Ample evidence documents the tendency of research subjects to attribute to themselves socially desirable traits and to deny having socially undesirable qualities. This tendency is particularly marked among subjects who are defensive, lacking in self-esteem, or sensitive to status differences. Drug addicts often have all of these characteristics. This paper examines the extent to which need for social approval is reflected in methadone patients' and family members' self-reports of personal and family functioning. Results demonstrate the importance of taking the approval motive into account when conducting research with this population. Addicts tend to deny negative things about themselves and their families, while family members tend to exaggerate their own and their families' positive qualities. Implications for drug treatment programs and researchers are discussed.