entering the Washington State pni son system. A total of 109 male of fenders were interviewed. The study was conducted in accordance with the institution's policy stipulating that inmates must give informed consentto participate in any research activity. To determine if the sample was representative of the Washington State inmate population, the group who were interviewed were corn pared with a larger sample of 1,409 consecutive admissions to the necep iion center. No significant diffenenc es between the groups in age, eth nicity, marital status, offense, on IQ were found. In addition, no differ ences between groups were found in scores on the Minnesota Multiphasic Personality Inventory, the Buss Durkee Hostility Inventory, the Sui cide Probability Scale, the Veterans AlcoholScneeningTest,onthe Mon roe Dyscontrol Scale. Individuals who show extremely violent on psy chotic behavior are sent directly to a prison psychiatric ward. Thus in mates with severe psychiatric distur bance are probably undenrepresent ed in the sample discussed in this paper. Measures. Responses to ques iions on the Diagnostic Interview Schedule (DIS) (5) were used to de tenmine lifetime prevalence of the following DSM-IH-R axis I or axis II diagnoses: depression, dysthymia, alcohol abuse on dependence, drug abuse on dependence, schizophre nia, schizophreniform disorder, mania, and antisocial personality dis order. To assess intenraten reliability, pairs of interviewers drawn from a group of five interviewed 24 in mates. The diagnoses made in each joint interview were analyzed using an extension of kappa (kappa v) (6), John A. Chiles, M.D. Elizabeth Von Cleve, Ph.D. Ron P. Jemelka, Ph.D. Eric W. Trupin, Ph.D.