With data drawn from the juvenile court records of 257 adjudicated male African American youth offenders aged 12 to 17, the present study examines this adolescent population's involvement in assaultive interpersonal violence within the context of a descriptive evaluation of co-occurring alcohol use disorder, other drug use disorder, and other mental disorders. Comorbidity was assessed by calculating the prevalence rates for co-occurring interpersonal violence and the three disorders. The results of this investigation failed to support the notion that interpersonal violence and substance use or other mental disorders arise from the same source; rather, they offer cautious optimism about …