Montana Title 40. Family Law § 40-6-113. Evidence relating to paternity

(1) evidence of sexual intercourse between the mother and alleged father at any possible time of conception;

(2) an expert's opinion concerning the statistical probability of the alleged father's paternity based upon the duration of the mother's pregnancy;

(3) paternity test results, weighted in accordance with evidence, if available, of the statistical probability of the alleged father's paternity;

(4) medical or anthropological evidence relating to the alleged father's paternity of the child based on tests performed by experts. If a man has been identified as a possible father of the child, the court may, and upon request of a party shall, require the child, the mother, and the man to submit to appropriate tests; and

(5) all other evidence relevant to the issue of paternity of the child.