Given that the rates of alcohol-related accidents and arrests have been steadily increasing, a focus on treatment outcomes for those arrested for driving under the influence (DUI) is warranted. The number of female DUI offenders has also increased, but little research has been done to see if they differ from male offenders. Studies have indicated that sex and education were determining factors in treatment outcome among the general population of residential treatment programs. This study was to see whether the sex and a curvilinear effect of education level predicted outpatient treatment dropout specifically among DUI offenders. Gendered pathways theory, which focused on the differences between male and female offending, provided the theoretical foundation for this study. This study examined archival data of 291 male and 76 female DUI offenders in substance abuse treatment programs. A multiple regression analysis was conducted to determine if sex and education were predictors of treatment dropout, and whether education levels exhibited a curvilinear relationship with treatment dropout. Results indicated that sex and education, and the curvilinear component related education, were not statistically significant predictors of treatment dropout. The social change implications would be to generate more studies involving other predictor variables, such as motivation, personality factors, etc., which might better predict treatment dropout. These studies, if better predictors, could benefit DUI offenders by providing programs that meets specific needs and could lower the treatment rate dropout. Also, specific programming for DUI offenders would allow successful transitioning back into the community, make a positive impact on the offender and their family, would reduce healthcare costs due to effective interventions for DUI offenders, and would reduce recidivism rates.