The bill establishes new labeling requirements for pasteurized milk sold in Montana, mandating that processors include a "best by" date on each container, indicating the freshness and safety of the milk after pasteurization. This date, which can also be referred to as a "use by" date, must be clearly displayed in Arabic numerals or standard abbreviations, with labels contrasting in color from their background. Additionally, the bill specifies the placement and size of the labels, stating that they must be at least 1/8 inch in height and located appropriately on the containers. Milk that does not comply with these labeling requirements may be seized and destroyed by department agents.

Furthermore, the bill requires the Department of Livestock to amend existing administrative rules to remove the definition of a "sell by" date and repeals several related rules. Importantly, the department is prohibited from adopting any new rules regarding the implementation of these labeling requirements. The act is intended to be codified as part of Title 81, chapter 21, and will take effect immediately upon passage and approval.