Mo. Const. art. I, § 19

That no person shall be compelled to testify against himself in a criminal cause, nor shall any person be put again in jeopardy of life or liberty for the same offense, after being once acquitted by a jury; but if the jury fail to render a verdict the court may, in its discretion, discharge the jury and commit or bail the prisoner for trial at the same or next term of court; and if judgment be arrested after a verdict of guilty on a defective indictment or information, or if judgment on a verdict of guilty be reversed for error in law, the prisoner may be tried anew on a proper indictment or information, or according to the law. [Effective - 27 Feb 1945 , see footnote]