Externalizing and self-medicating: Heterogeneity among repeat DUI offenders.

•DUI re-offenders can be classified into at least three subtypes..•DUI re-offender subtypes include externalizing and self-medicating subtypes.•Many DUI re-offenders have a criminal history that extends beyond DUI offense.•More than half of DUI re-offenders have a history of psychiatric comorbidity.•Mental health and criminality are both risk factors for arrest among DUI offenders.