Mo. Rev. Stat. § 454.542

If an employee of the division, a circuit clerk or an employee of the payment center is served * with a subpoena, subpoena duces tecum or an order to produce records, the employee or clerk may comply with the subpoena or order by transmitting a certified copy of the record to the requesting party. No party shall offer such records into evidence in response to a subpoena pursuant to this section unless all other parties to the action have been served with copies of such records and certification at least seven days prior to the commencement of the trial. A copy of properly certified records shall be admissible as evidence in all court or administrative proceedings.