Mo. Rev. Stat. § 490.060
The printed books of cases adjudged in the courts of a sister state may be admitted as evidence of the unwritten or common law of such state.
(RSMo 1939 § 1865)
Prior revisions: 1929 § 1701; 1919 § 5388; 1909 § 6332
(1966) Trial judge has duty in each case to determine whether a child under ten is competent before permitting the child to testify. State v. Tandy (Mo.), 401 S.W.2d 409.