Versions of Montana Code 37-42-321. Revocation of operator\'s certificate -- disciplinary action by department on LawServer 2023 Montana Code 37-42-321. Revocation of operator’s certificate — disciplinary action by department 2022 Montana Code 37-42-321. Revocation of operator’s certificate — disciplinary action by department 2021 Montana Code 37-42-321. Revocation of operator’s certificate — disciplinary action by department 2019 Montana Code 37-42-321. Revocation of operator’s certificate — disciplinary action by department 2018 Montana Code 37-42-321. Revocation of operator’s certificate — disciplinary action by department 2016 Montana Code 37-42-321. Revocation of operator’s certificate — disciplinary action by department 2014 Montana Code 37-42-321. Revocation of operator’s certificate — disciplinary action by department 2013 Montana Code 37-42-321. Revocation of operator’s certificate — disciplinary action by department 2009 Montana Code 37-42-321 – Revocation of operator’s certificate — disciplinary action by department