Versions of Montana Code 37-42-302. Unlawful to operate plant or system without certified operator -- department to issue temporary certificates -- exception on LawServer 2023 Montana Code 37-42-302. Unlawful to operate plant or system without certified operator — department to issue temporary certificates — exception 2022 Montana Code 37-42-302. Unlawful to operate plant or system without certified operator — department to issue temporary certificates — exception 2021 Montana Code 37-42-302. Unlawful to operate plant or system without certified operator — department to issue temporary certificates — exception 2019 Montana Code 37-42-302. Unlawful to operate plant or system without certified operator — department to issue temporary certificates — exception 2018 Montana Code 37-42-302. Unlawful to operate plant or system without certified operator — department to issue temporary certificates — exception 2016 Montana Code 37-42-302. Unlawful to operate plant or system without certified operator — department to issue temporary certificates — exception 2014 Montana Code 37-42-302. Unlawful to operate plant or system without certified operator — department to issue temporary certificates — exception 2013 Montana Code 37-42-302. Unlawful to operate plant or system without certified operator — department to issue temporary certificates — exception 2009 Montana Code 37-42-302 – Unlawful to operate plant or system without certified operator — department to issue temporary certificates — exception