Mont. Code Ann. § 28-10-702
A person who assumes to act as an agent is responsible to third persons as a principal for acts in the course of the agency in any of the following cases and in no other:
History: En. Sec. 3131, Civ. C. 1895; re-en. Sec. 5453, Rev. C. 1907; re-en. Sec. 7968, R.C.M. 1921; Cal. Civ. C. Sec. 2343; Field Civ. C. Sec. 1256; re-en. Sec. 7968, R.C.M. 1935; R.C.M. 1947, 2-212; amd. Sec. 813, Ch. 56, L. 2009.