Mo. Rev. Stat. § 277.120: Records, authority to inspect — subpoena powers — financial records confidential, exception.

The state veterinarian or his duly authorized representative may inspect the records of any livestock sales or market licensee, at any reasonable time, to determine the origin and destination of any livestock handled by the licensee, or to determine if any provision of this chapter has been violated. In addition, the state veterinarian may subpoena any market record or any record relating to a market transaction. Such subpoena shall be enforceable in the circuit court of the county in which the livestock market is located or wherein any livestock sale transaction is consummated. Any documents or records obtained by the state veterinarian or his representatives which reveal the financial condition of a licensee shall be deemed confidential, and shall not be disclosed except at a hearing before the director or a court.