Montana Title 1. General Laws and Definitions § 1-2-203. Effect of amendment of statute

Where a section or a part of a statute is amended, it is not to be considered as having been repealed and reenacted in the amended form, but the portions which are not altered are to be considered as having been the law from the time when they were enacted, and the new provisions are to be considered as having been enacted at the time of the amendment.