Mo. Rev. Stat. § 476.250

No court shall be open or transact business on Sunday, unless it be for the purpose of receiving a verdict or discharging a jury; and every adjournment of a court on Saturday shall always be to some other day than Sunday, except such adjournment as may be made after a cause has been committed to a jury; but this section shall not prevent the exercise of the jurisdiction of any judge, when it shall be necessary in criminal cases, to preserve the peace or arrest the offender, nor shall it prevent the issuing and service of any attachment in a case where a debtor is about fraudulently to secrete or remove his effects, nor shall it prevent the issuing and service of such orders as exigencies may require.