Mo. Rev. Stat. § 540.310 : — CRIMINAL PROCEDUREGrand Juries and Their Proceedings — Cannot be compelled to disclose vote TEXT PDF No member of a grand jury shall be obliged or allowed to testify or declare in what manner he or any other member of the grand jury voted on any question before them, or what opinions were expressed by any juror in relation to any such question. § 540.310, RSMo RSMo 1939 § 3923 Prior revisions: 1929 § 3534; 1919 § 3879; 1909 § 5087