Missouri Revised Statutes Title XVII. Agriculture and Animals § 276.615. Records to state veterinarian, when

1. If the state veterinarian has reasonable cause to believe any livestock in this state are diseased in such a manner as to constitute a health hazard to other livestock, wherever located, he may request in writing the livestock sales records of any livestock dealer in this state for the purpose of tracing or discovering the diseased livestock, the source of the disease and all other livestock which may be affected by the disease. A livestock dealer shall have twenty-four hours to comply with such a request.

2. The state veterinarian may inspect, acquire and use such records only for the detection and eradication of disease and for no other purpose.