Participants included 104 males and 99 females between ages 11 and 18 years. All participants were in an acute-care adolescent psychiatric treatment facility in northwest Ohio and had a primary psychiatric diagnosis. The most common psychiatric diagnoses were depression, anxiety, and conduct disorder. They were administered the screening instrument and interviewed by a certified chemical dependency counselor within a few days of admission. The diagnosis of a drug abuse disorder was based on the criteria from the DSM-III-R. Results revealed a concurrence rate of 90.20 percent for the interview and screening instruments. Agreement rates were somewhat higher for youths ages 16 or older than for those 15 or under. Forty-one percent of the youths had substance abuse disorders. The prevalence of dual diagnosis supports including a drug abuse screening as part of the standard intake and assessment in adolescent psychiatric treatment programs. Tables, author photograph and biography, and 8 references