interviews and the parallel Adult Behavior Checklist-Friend (ABCL-F) (Achenbach & Rescorla, 2003) used for peer interviews. Alcohol Abuse Disorder was defined according to the Alcohol and Drug Module of the NIMH Diagnostic Interview Schedule (DIS) (Robins et al., 1981) completed by participants and nominated peers. Marijuana Abuse (defined as 27 or more days of use in the past month) and Serious Substance Use (cocaine, crack, inhalants, heroin, LSD, PCP, ecstasy, mushrooms, speed and other pills not prescribed by a physician in the past month) were defined from participant responses to the Tobacco, Alcohol and Drugs Version-III, a 57-item open-ended and forced-choice instrument based on measures from the National Longitudinal Study of Adolescent Health (Bureau of Labor Statistics, 2002) and from peer responses to an identical instrument adapted for this study.
