Mo. Rev. Stat. § 408.683
A government authority may obtain financial records pursuant to a subpoena if:
(2) A copy of the subpoena has been served upon the customer or mailed to his last known address on or before the date on which the subpoena is served on the financial institution together with the following notice:
"Records or information concerning your transactions held by the financial institution named in the attached subpoena (or other process) are being sought by the (agency or department) in accordance with the Missouri Right to Financial Privacy Act for the following purpose: (state purpose with reasonable specificity)
If you desire that such records or information not be made available, you must:
4. Be prepared to go to court or to the issuing authority and present your position in further detail.
You do not need to have a lawyer to represent yourself, although you may wish to employ one to represent you and protect your rights.
If you do not follow the above procedures, upon the expiration of ten days from the date of service or fourteen days from the date of mailing of this notice, the records or information requested therein will be made available. These records may be transferred to other government authorities for legitimate government investigations.";
and
(L. 1989 H.B. 82 § 6)