Focusing on individuals with cannabis use disorders, Budney and colleagues developed a computerized approach encompassing MI, CBT and contingency management (Budney et al., 2015). In a randomized controlled trial, 75 adults with marijuana use disorder were randomized to 2 sessions of brief treatment versus a 9-session clinician-delivered MET-CBT approach, or a 9-session version of TES emphasizing MET and CBT. Both MET/CBT conditions included a CM component in which participants could earn up to $435 in gift cards if all urines were negative for cannabis. Significantly more participants in clinician-delivered treatment (44.8%) and TES (46.7%) were abstinent at the end of treatment compared with the 2-session brief treatment (12.5%). Similarly, both the therapist- and computer delivered approaches were significantly more effective in reducing cannabis use compared with brief intervention alone during treatment, but effects weakened during follow-up and were no longer significant at the 6-month follow-up point. Again, it was not possible to disentangle the effects of MET/CM versus the contingency component in understanding what drove reductions in cannabis use. Interventions combining MI and CBT, without a contingency management component, have
