using the Alco-Sensor IV (Intoximeter Inc., St. Louis, MO) at the same intervals, as well as other subjective and objective measures as part of the larger study. During portions of the session when measures were not being obtained, participants were allowed to relax in a comfortable room and watch television or movies, and/or read. At the end of each session, participants were transported home by a livery service. The study was fully approved by The University of Chicago Institutional Review Board.
