If a grand juror knows of the commission of an indictable offense, or any material fact touching the same, he must declare such fact to his fellows, and be sworn as a witness upon the investigation before them.
Mo. Rev. Stat. § 540.220
Grand juror as witness, when
Effective: 28 Aug 1939; (RSMo 1939 § 3930); Prior revisions: 1929 § 3541; 1919 § 3886; 1909 § 5094
Official source: Missouri Revisor of Statutes. Reproduced from public-domain Missouri statutes; confirm against the official source for the current text. Not legal advice.