Mont. Code § 20-5-107
In lieu of the provisions of 20-5-106 and when an attendance officer is satisfied that a pupil or a child subject to compulsory attendance is not able to attend school because the child does not have the physical capacity or the child is absolutely required to work at home or elsewhere in order to provide support for the child or the child's family, the attendance officer shall report the case to the authorities charged with the relief of the poor. The welfare authorities shall offer relief that will enable the child to attend school. If the parent, guardian, or other person who is responsible for the care of the child denies or neglects the assistance offered to enable the child to attend school, the child must be committed to a state institution, at the discretion of the court.
§ 20-5-107, MCA