Participants were scheduled for an alcohol challenge session approximately one week after the initial interview. Participants were given an information packet prior to their laboratory appointment, which instructed them to refrain from alcohol for 24 hours before the session and to refrain from other drug use for 48 hours. They were instructed to refrain from eating or drinking caffeinated or dairy beverages for 8 hours prior to their session (starting at 12 midnight the prior evening). Participants arrived at the laboratory at 8:00 a.m. A questionnaire was administered to verify compliance with pre-session instructions. A breath alcohol test was used to verify abstinence from alcohol. Females were given a urine pregnancy test and excluded from the study if they tested positive. A standard low-fat breakfast (bagel and juice) was provided.
