No law contained in any of the statutes of Montana is retroactive unless expressly so declared.
§ 1-2-109, MCA
En. Sec. 3, Pol. C. 1895; re-en. Sec. 3, Rev. C. 1907; amd. Sec. 1, Ch. 4, L. 1921; re-en. Sec. 3, R.C.M. 1921; Cal. Pol. C. Sec. 3; re-en. Sec. 3, R.C.M. 1935; R.C.M. 1947, 12-201.