Missouri Revised Statutes § 326.322 - Client confidentiality rules
A licensee generally may not disclose client communications or be examined about them without client consent, subject to stated exceptions.
326.322. Client confidentiality rules. — 1. Except by permission of the client for whom a licensee performs services or the heirs, successors or personal representatives of such client, a licensee pursuant to this chapter shall not voluntarily disclose information communicated to the licensee by the client relating to and in connection with services rendered to the client by the licensee. The information shall be privileged and confidential, provided, however, that nothing herein shall be construed as prohibiting the disclosure of information required to be disclosed by the standards of the public accounting profession in reporting on the examination of financial statements or as prohibiting disclosures in investigations, in ethical investigations conducted by private professional organizations, or in the course of peer reviews, or to other persons active in the organization performing services for that client on a need-to-know basis or to persons in the entity who need this information for the sole purpose of assuring quality control. 2. A licensee shall not be examined by judicial process or proceedings without the consent of the licensee's client as to any communication made by the client to the licensee in person or through the media of books of account and financial records, or the licensee's advice, reports or working papers given or made thereon in the course of professional employment, nor shall a secretary, stenographer, clerk or assistant of a licensee, or a public accountant, be examined, without the consent of the client concerned, regarding any fact the knowledge of which he or she has acquired in his or her capacity as a licensee. This privilege shall exist in all cases except when material to the defense of an action against a licensee. (L. 2001 H.B. 567)