Mo. Rev. Stat. § 210.836: Evidence relating to paternity.

Evidence relating to paternity may include:

(1) Evidence of sexual intercourse between the mother and the alleged father during the possible time of conception of the child;

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

(3) Blood test results, weighed in accordance with the evidence of the statistical probability of the alleged father's paternity of the child;

(4) Medical or anthropological evidence relating to the alleged father's paternity of the child based on tests performed by experts; and

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