Mont. Code Ann. § 50-32-203

If any drug is designated, rescheduled, or deleted as a "controlled substance" under federal law and notice thereof is given to the board, the board shall similarly control the drug under this chapter after the expiration of 30 days from publication in the Federal Register of a final order designating a drug as a "controlled substance" or rescheduling or deleting a drug unless, within that 30-day period, the board objects to inclusion, rescheduling, or deletion. In that case, the board shall cause the reasons for objection to be published and afford all interested parties an opportunity to be heard. At the conclusion of the hearing, the department shall publish the board's decision which shall be final unless altered thereafter by the board or by statute. Upon publication of objection to inclusion, rescheduling, or deletion under this chapter by the board, control under this chapter is stayed until the board's decision is published.