Informal Opinion Number: 2026-11

Adoption Date: August 3, 2026

Rules: 4 dash–1.6; 4 dash–1.9
Client-Lawyer Relationship
Confidentiality of Information
Subject: Confidentiality
Summary: confidentiality issues for lawyer subpoenaed for deposition regarding a former client

Question: Ten years ago, Lawyer A created a declaration of trust for property for a client, Grantor, and named one of Grantor’s children, Child 1, as trustee.  Lawyer A also did additional estate planning for Grantor.  Five years ago, Lawyer B amended the declaration of trust to add another child of Grantor, Child 2, as a co-trustee with Child 1.  Two years ago, Grantor passed away.  A dispute arose between the co-trustees as to the property in the declaration of trust, and Child 1 sued Child 2.  Lawyer A has been subpoenaed to testify as to Grantor’s intent as to the property in trust, as well as the rest of the estate plan.  Would Lawyer A violate any Rules of Professional Conduct if Lawyer A sat for a deposition or testified pursuant to a subpoena at trial in the underlying litigation between Child 1 and Child 2?      

Answer:  The Rules of Professional Conduct do not prohibit Lawyer A, per se, from testifying during a deposition or at trial pursuant to subpoena in the underlying litigation,   however, Rules 4 dash–1.9(c) and 4 dash–1.6 may severely restrict Lawyer A’s ability to testify to relevant issues in the underlying lawsuit.  Rule 4 dash–1.9 addresses a lawyer’s duty to former clients.  Subsection (c)(2) provides that a lawyer who has formerly represented a client in a matter shall not reveal information relating to the representation except as permitted by the Rules of Professional Conduct.  Rule 4 dash–1.6(a), in turn, provides that a lawyer may not reveal information relating to the representation of a client unless the client gives the lawyer informed consent, the disclosure is impliedly authorized to carry out the representation, or the disclosure is permitted by Rule 4 dash–1.6(b).

Rule 4 dash–1.6 survives the death of a client.  See Comment [17] to Rule 4 dash–1.6 and Missouri Informal Opinion 990146.  The confidentiality provisions of Rule 4 dash–1.6 are much broader than the substantive law issues of attorney-client and work product privileges. Confidentiality covers all information related to the representation, no matter its source.”[1]  See Rule 4 dash–1.6, Comment [3].

Thus, Rule 4 dash–1.6 will prohibit Lawyer from revealing information about Grantor’s estate planning unless the disclosure was impliedly authorized, Granter gave informed consent to Lawyer to do so, or one of the Rule 4 dash–1.6(b) exceptions apply.

Informed consent as used in Rule 4 dash–1.6 is defined as the “agreement by a person to a proposed course of conduct after the lawyer has communicated adequate information and explanation about the material risks of and reasonably available alternatives to the proposed course of conduct.”  Rule 4 dash–1.0(e).

Rule 4 dash–1.6(b) provides that “[a] lawyer may reveal information relating to the representation of a client to the extent the lawyer reasonably believes necessary: …(4) to comply with other law or a court order.”  Determining if there is “other law” that permits disclosure of the Grantor’s confidences is a matter of law and beyond the scope of the Rules of Professional Conduct.  Lawyer A should consult Comment [10] to Rule 4 dash–1.6 for additional guidance as to any possible exception at law and use independent professional judgment on this issue.

A subpoena is not enough to require disclosure of client confidences.  Rather it must be a court order and Lawyer A must assert “all nonfrivolous claims that the order is not authorized by other law or that the information sought is protected against disclosure by the attorney-client privilege or other applicable law.”   Comment [11] to Rule 4 dash–1.6.  If the court orders the disclosure of client confidences and an appeal is not sought, Lawyer A may comply with the court’s order.   See Comment [11] to Rule 4 dash–1.6; See also Missouri Informal Advisory Opinions 20060004, 20010154, 2017 dash–04, 2026 dash–04, and 2026 dash–06.

In the event that disclosure is permitted by Rule 4 dash–1.6(b), Lawyer A should consult Comments [12] and [13] to Rule 4 dash–1.6 for guidance on ensuring that the disclosure is only to the extent Lawyer A reasonably believes is necessary to accomplish the specified purpose.

 

[1] Related bodies of law address confidentiality through attorney-client privilege and the work-product doctrine, but interpretations of those principles are matters of law and beyond the scope of the Rules of Professional Conduct.  See Rule 4–1.6, Comment [3].

Informal Opinions are ethics advisory opinions issued by the Office of Legal Ethics Counsel to members of the Bar about Rule 4 (Rules of Professional Conduct)Rule 5 (Complaints and Proceedings Thereon), and Rule 6 (Fees to Practice Law) pursuant to Missouri Supreme Court Rule 5.30(c). Written summaries of select Informal Opinions are published for informational purposes as determined by the Advisory Committee of the Supreme Court of Missouri pursuant to Rule 5.30(c). Informal opinion summaries are advisory in nature and are not binding. These opinions are published as an educational service and do not constitute legal advice.

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