Mo. Rev. Stat. § 58.440: Refusal to testify — penalty.

Any person summoned as a witness to appear before the coroner, and attending, who shall refuse to give evidence which may be lawfully required to be given by such person, on oath or affirmation, may be committed to the city or county jail by the coroner, there to remain without bail until he give such evidence or be discharged by due course of law.