Barriers to Substance Abuse Treatment: Why Validation Plays a Crucial Role Overview: Drug and Alcohol Treatment Programs Successful completion of a drug and alcohol treatment program and an increase in length of time spent in treatment have been associatewith more positive treatment outcomes [1, 2, 3, 4, 5], a higher likelihood of attending aftercare programs [6], and a greater chance at long-term maintenance of abstinence. Conversely, unsuccessful treatment completion has serious clinical implications for the client. Clients who do not complete treatment closely resemble patients who have never received any type of treatment for substance use disorders [7], are at a higher risk of relapse [1], and are at a greater risk of a fatal overdose [5]. Completion of a drug and alcohol treatment program is likely to increase positive results in attending aftercare interventions. Several factors have been identified in the recent literature that contributes to a higher likelihood of individuals not completing treatment drug and alcohol treatment. Although legal coercion (i.e., court mandated treatment) has been shown to reduce the risk of treatment non-completion [8], having a criminal history and multiple arrests within 12 months preceding treatment admission has been linked to increased rates unsuccessful treatment completion [9].Furthermore, clients who reported having a primary drug of choice other than alcohol (particularly those who reported using heroin or cocaine) and recent drug use prior to admission tended to exhibit more severe substance use concerns than those who reported their primary drug of choice as alcohol [9, 10].Hambley, Arbour, and Sivgnanasundaram (2010) found that clients who exhibited a greater severity of substance use and had multiple previous treatment episodes had a higher