Mo. Rev. Stat. § 276.646: Director granted subpoena power — venue, where.

If any livestock dealer fails or refuses to comply with the provisions of sections 276.600 to 276.661, the director may subpoena such person and all livestock sales and purchase records. Upon refusal of any person to comply with any such subpoena, the director may petition the circuit court having venue for an order enforcing such subpoena. Upon failure of any person to obey a court order enforcing the director's subpoena, the court issuing such order shall find that person in contempt and punish him as provided by law. For purposes of this section venue shall be in the circuit court of any county in which the livestock dealer regularly purchases or sells any livestock.