Mo. Rev. Stat. § 265.420: Records required, inspection permitted, records to be retained.

1. The director may require any commercial plant which slaughters, processes, renders, transports, stores, ships or receives livestock, poultry, meat or meat products intended for human consumption to maintain records relative to the above transactions and may require it to permit an authorized representative of the director to have access to copy such records at reasonable times.

2. All records required by this section shall be preserved for two years after the transaction has taken place.