Versions of Montana Code 2-9-905. Affirmative defense -- reasonable measures consistent with regulations, orders, and public health guidance on LawServer 2023 Montana Code 2-9-905. Affirmative defense — reasonable measures consistent with regulations, orders, and public health guidance 2022 Montana Code 2-9-905. Affirmative defense — reasonable measures consistent with regulations, orders, and public health guidance 2021 Montana Code 2-9-905. Affirmative defense — reasonable measures consistent with regulations, orders, and public health guidance