Montana Title 28. Contracts and Other Obligations § 28-1-202. Obligation of one who unilaterally decides to render service

A person who officiously and without the consent of the real or apparent owner of a thing takes it into the person's possession for the purpose of rendering service about it must complete the service and use ordinary care, diligence, and reasonable skill about the service. The person is not entitled to any compensation for the service or expenses, except that the person may deduct actual and necessary expenses incurred by the person about the service from any profits that the service has caused the thing to acquire for its owner and shall account to the owner for the residue.