Bourdon JL, Francis MW, Jia L, et al. - The impact of various medical cannabis policies on substance use treatment admission has been explored in recent years, however lacunae remain concerning factors linked with participants' treatment engagement and outcome. Researchers herein analyzed national data with the aim to determine how cannabis policies (decriminalized, medical, and recreational) and referral sources (criminal justice vs voluntary) have influenced treatment completion and length of stay. The Treatment Episode Data Set-Discharge (2006–2017) on adults 18+ whose primary drug at treatment admission was cannabis yielded data for this work. Effect of state cannabis policies on treatment length of stay but not on treatment completion was evident. This relationship was identified to be affected by the referral source—criminal justice (CJ) or voluntary (V). They identified no effect of policy on treatment completion for either CJ or V referrals. Reduced length of stay for CJ and V referrals were observed in correlation with decriminalization policies.