Mont. Code Ann. § 42-2-103
Interstate placement
42-2-103 . Interstate placement. The Interstate Compact on the Placement of Children, Title 41, chapter 4, governs:
(1) an adoption in this state of a child brought into this state from another state by a prospective adoptive parent;
(2) a person residing in or an agency doing business from another state who places the child for adoption in this state; and
(3) the placement of a Montana child in another state.