When a California lawyer needs to serve a discovery subpoena on a current client of the lawyer's firm in an unrelated matter, is that a conflict, and can it be cured by informed written consent?

Plain-English summary

The opinion analyzes a hypothetical where Attorney runs a conflict check before agreeing to represent Prospective Client and learns that Witness Client, a potential third-party witness with critical documents, is being represented by another lawyer at Attorney's firm in an unrelated matter. The question is whether Attorney can take the case and serve a discovery subpoena on Witness Client, and if so, under what conditions.

The opinion first asks whether serving a discovery subpoena on a current client is "adverse" within the meaning of California conflicts law. The committee, drawing on Flatt v. Superior Court (1994), Hernandez v. Paicius (2003), Ames v. State Bar (1973), American Airlines v. Sheppard, Mullin (2002), and California State Bar Formal Opinion 1993-133, defines "adverse" as conduct that places the lawyer in a position of potential injury to the client. The committee notes that "discovery is coercion" (citing O'Mary v. Mitsubishi Electronics America) and concludes that subpoenaing a current client is adverse and would violate the duty of loyalty absent proper consent.

The committee then concludes that the conflict can be cured by informed written consent. Drawing on former Rule 3-310(C)(1)-(3) and (E) and on Flatt, the committee reasons that if conflicts arising from concurrent representation involving material confidential information may be waived in writing, so too may a loyalty conflict arising from third-party discovery on a current client.

The opinion sets out detailed disclosure obligations. To Prospective Client, Attorney must disclose the fact and nature of the firm's representation of Witness Client (subject to confidentiality limits on client identity from Los Angeles County Bar Formal Opinions 374 and 456), the firm's relationship with Witness Client, and the reasonably foreseeable adverse consequences, including that the firm cannot enforce the subpoena against Witness Client without that client's consent and that the firm may be hesitant to seek documents Witness Client considers sensitive. To Witness Client, similar disclosure obligations apply with the additional protection of Prospective Client's confidences.

The committee also flags a separate duty: absent exigent circumstances or applicability of former Rule 1-650, attorneys should check for conflicts with adverse and potentially adverse parties and witnesses before accepting representation, and should refresh those checks as new parties or witnesses emerge.

In practice

Under California's rules as they stood at the time of the opinion, the analysis proceeds in three steps. First, identify the adverse-discovery posture: serving a discovery subpoena on a current client of the lawyer's firm is adverse under the committee's reading of former Rule 3-310, regardless of whether the witness client is a party. Second, run informed-written-consent disclosure to both clients, addressing the firm's relationships, foreseeable adverse consequences, and the limits on enforcement absent consent. Third, refresh the conflict check throughout the representation as new persons or entities appear. The committee notes that if Witness Client refuses to consent, the opinion does not address whether Attorney may ethically do anything other than decline the representation. Verify against current Rule 1.7 before relying on this framework.

Common questions

Q: Is serving a subpoena on a current client of the lawyer's firm a conflict of interest?

A: Per the opinion, yes. The committee concludes that "serving any type of third-party discovery on a current client is adverse and would violate an attorney's duty of loyalty" absent proper consent.

Q: Does it matter that the witness client is represented on a wholly unrelated matter?

A: Per the opinion, no. The committee relies on Flatt v. Superior Court for the rule that representation adverse to a current client on any matter, "whether related or unrelated," is a duty-of-loyalty breach.

Q: Can the firm cure the conflict by associating outside counsel to serve the subpoena?

A: Per the opinion, the committee flags but does not resolve the question. The committee cites Cal West Nurseries v. Superior Court (2005) and UMG Recordings v. MySpace (C.D. Cal. 2007) as suggesting association may not be permitted, while noting ABA Formal Opinion 92-367 suggesting independent counsel may serve discovery when the conflict arises after the representation is underway.

Q: What does Attorney have to disclose to obtain informed written consent from Prospective Client?

A: Per the opinion, Attorney must disclose the firm's representation of Witness Client, the nature of that representation and the firm's relationship with Witness Client, that the firm cannot serve discovery on Witness Client absent Witness Client's consent, and that without that consent the firm cannot pursue enforcement of the subpoena.

Q: Can Attorney disclose the existence of the firm's representation of Witness Client without Witness Client's consent?

A: Per the opinion, in most cases yes. The committee, citing Los Angeles County Bar Formal Opinions 456 and 374, notes the identity of a client is generally not confidential. The opinion flags narrow exceptions (citing Rosso v. Superior Court and Baird v. Koerner) where client identity is privileged.

Q: Does the opinion address what happens if Witness Client refuses consent?

A: Per the opinion, no. Footnote 2 expressly declines to address whether Attorney may ethically do anything other than decline the representation should Witness Client refuse to consent.

Background and rules framework

Former Rule 3-310 governs avoiding the representation of adverse interests in California. Section (E) addresses representation adverse to a former client where the lawyer obtained confidential information material to the employment; sections (B) and (C) address concurrent representation conflicts and require disclosure or informed written consent. Former Rule 1-650 dispenses with conflict-check requirements in certain pro bono limited legal services representations. The opinion compares ABA Model Rule 1.7 Comment [3], which requires firms to adopt reasonable conflict-check procedures, with the silence of California's rule on conflict checks. The current California analogue is Rule 1.7.

Citations and references

Rules of Professional Conduct (former, in effect at time of opinion):

• Former California Rule 3-100 (Confidential Information of a Client)
• Former California Rule 3-110 (Failing to Act Competently)
• Former California Rule 3-310 (Avoiding Representation of Adverse Interests), particularly (A), (B), (C), and (E)
• Former California Rule 1-650 (Limited Legal Service Programs)

ABA Model Rules (referenced for guidance):

• ABA Model Rule 1.7, Comment [3]

Statutes:

• California Business and Professions Code section 6068(e)

Cases:

• Flatt v. Superior Court (1994) 9 Cal.4th 275, per se disqualification for concurrent adverse representation
• Anderson v. Eaton (1930) 211 Cal. 113, attorney duty of loyalty
• People ex rel. Dept. of Corporations v. SpeeDee Oil Change Systems (1999) 20 Cal.4th 1135
• Oasis West Realty v. Goldman (2011) 51 Cal.4th 811
• Hernandez v. Paicius (2003) 109 Cal.App.4th 452, cross-examination of current client
• Ames v. State Bar (1973) 8 Cal.3d 910, defining "adverse"
• American Airlines v. Sheppard, Mullin, Richter & Hampton (2002) 96 Cal.App.4th 1017
• People v. Rhodes (1974) 12 Cal.3d 180, city attorney conflict
• Goldstein v. Lees (1975) 46 Cal.App.3d 614
• O'Mary v. Mitsubishi Electronics America (1997) 59 Cal.App.4th 563, discovery as coercion
• Cal West Nurseries v. Superior Court (2005) 129 Cal.App.4th 1170, firm disqualification for serving discovery on current client
• UMG Recordings v. MySpace (C.D. Cal. 2007) 526 F.Supp.2d 1046
• Zador Corp. v. Kwan (1995) 31 Cal.App.4th 1285, scope of conflict-waiver disclosure
• Maxwell v. Superior Court (1982) 30 Cal.3d 606
• Klemm v. Superior Court (1977) 75 Cal.App.3d 893, directly adverse litigation
• Streit v. Covington & Crowe (2000) 82 Cal.App.4th 441, imputation
• In re Marriage of Friedman (2002) 100 Cal.App.4th 65
• Rosso, Johnson, Rosso & Ebersold v. Superior Court (1987) 191 Cal.App.3d 1514, privileged client identity
• Baird v. Koerner (9th Cir. 1990) 279 F.2d 623, last-link doctrine

Other opinions cited:

• ABA Formal Opinion 92-367, third-party discovery on current client
• California State Bar Formal Opinion 1993-133
• Los Angeles County Bar Formal Opinions 374 and 456, client identity disclosure

See also

• CA COPRAC Op. 1998-152: Imputed Knowledge and Former Client Consent
• CA COPRAC Op. 1999-153: Joint Representation Corporation and Shareholder
• CA COPRAC Op. 2003-163: Corporate Constituent Personal Representation Conflicts
• CA COPRAC Op. 2014-191: Concurrent Representation Debtor Creditor

Source

• Landing page: https://www.calbar.ca.gov/legal-professionals/ethics-compliance-practice-resources/ethics/ethics-opinions
• Original PDF: https://www.calbar.ca.gov/sites/default/files/2025-11/2011-182%20%5B08-0003%5D%20Final%20Publication-PAW.pdf

Original opinion text

Reproduced from the official source for research purposes. The linked source is authoritative.

THE STATE BAR OF CALIFORNIA
STANDING COMMITTEE ON
PROFESSIONAL RESPONSIBILITY AND CONDUCT
FORMAL OPINION NO. 2011-182

ISSUES: 1. When at the outset of representation it appears an attorney would need to serve a discovery subpoena for production of documents on another current client of the attorney or the attorney's law firm, may the attorney accept the representation of the new client and serve the discovery subpoena on the current client?
2. If doing so raises a conflict of interest, may the attorney seek informed written consent in order to accept the representation including possible service of the subpoena?
3. What obligations arise if an attorney seeks informed written consent?

DIGEST: When an attorney discovers at the outset of representation that the attorney must serve a discovery subpoena for production of documents on another current client of the attorney or the attorney's law firm, serving the discovery subpoena is an adverse action such that a concurrent client conflict of interest arises. To represent a client who seeks to serve such a subpoena, the attorney must seek informed written consent from each client, disclosing the relevant circumstances and the actual and reasonably foreseeable adverse consequences to the client providing consent.

AUTHORITIES INTERPRETED: Rules 3-100 and 3-310 of the Rules of Professional Conduct of the State Bar of California. Business and Professions Code section 6068, subdivision (e).

STATEMENT OF FACTS

Prospective Client requests Attorney to represent Prospective Client in litigation. Before agreeing to represent Prospective Client, Attorney runs a conflict check listing the adverse parties and all potential witnesses identified by Prospective Client and Attorney. The conflict check reveals that Witness Client, a potential witness who has documents critical to the litigation, is represented by Partner, another attorney at Attorney's law firm in an unrelated matter.

Is it a conflict of interest for Attorney to accept the representation of Prospective Client and serve a discovery subpoena for documents ("document subpoena") on Witness Client? If it is a conflict of interest, may Attorney do so with informed written consent of Prospective Client and Witness Client? What obligations arise if an attorney seeks informed written consent to such a representation?

DISCUSSION

1. Conducting Third Party Discovery of a Current Client is Adverse

This opinion addresses the issue of whether an attorney may accept representation of a new client when at the outset of the representation it appears the attorney would need to serve a discovery subpoena for documents on another existing client of the attorney's law firm. The first question is whether serving a document subpoena on a witness/client is "adverse" to the interests of that client. California law has not expressly defined "adverse" for purposes of analysis of conflicts between an attorney's clients. Neither rule 3-310 nor California case law supply an explicit definition in that context. In Flatt v. Superior Court (1994) 9 Cal.4th 275, the California Supreme Court held that it would be a breach of the duty of loyalty for an attorney to represent or provide advice to a client or person that is adverse to the interests of an existing client on any matter, whether related or unrelated. It is a violation of the duty of loyalty for an attorney to put himself in a position where he may have to choose between conflicting duties, or be led to attempt to reconcile conflicting interests, rather than to enforce to their full extent the rights of the interest which he should alone represent. In such circumstances, "the rule of disqualification ... is a per se or 'automatic' one."

While Flatt arose out of one client potentially suing another client, or party adversity, other cases have applied the proscription against adverse representation in situations where the existing client is a third-party witness rather than an adverse party. In Hernandez v. Paicius (2003) 109 Cal.App.4th 452, an attorney cross-examined her own current client during a trial in which he was an expert witness for the opposing party. The court stated the attorney's "representation ... required her to create a record impeaching her other client's professional reputation and credibility."

The California Supreme Court, in Ames v. State Bar (1973) 8 Cal.3d 910, cited a definition of "adverse" drawn from a dictionary: entailing "acting against or in a contrary direction…hostile, opposed, antagonistic," "in opposition to one's interests: detrimental, unfavorable," "having opposing interests."

Defining "adverse" as "potential injury" in the sense of at least threatening injury is also consistent with other authority. See American Airlines, Inc. v. Sheppard, Mullin, Richter & Hampton (2002) 96 Cal.App.4th 1017, 1043. Thus, "adverse" requires that the attorney has placed himself in a position of potential injury to the client.

Having defined "adverse" as "potential injury," we are led to the conclusion that serving any type of third-party discovery on a current client is adverse and would violate an attorney's duty of loyalty. First, as noted in O'Mary v. Mitsubishi Electronics America, Inc. (1997) 59 Cal.App.4th 563, 577, "discovery is coercion" since it entails bringing "[t]he force of law…upon a person to turn over certain documents." Second, propounding discovery on an existing client may affect the quality of an attorney's services to the client seeking the discovery. In addition, it is possible the documents sought could expose the client from whom discovery is being sought to claims from the client serving the discovery. Therefore, we conclude that Attorney's service of a document subpoena on Witness Client would be an action adverse to Witness Client's interests, and as a result such service would be prohibited absent proper consent.

2. Availability of Informed Written Consent from Each Client

Assuming Prospective Client wants to retain Attorney despite the firm's concurrent representation of Witness Client, the question arises whether Attorney may accept the representation and proceed with serving a document subpoena on Witness Client. We conclude that Attorney may do so, as long as Attorney believes that Attorney can properly fulfill his professional duties and obtains informed written consent from each client before accepting the representation of Prospective Client. The rules allow representation adverse to a current client with the client's informed written consent where the attorney has obtained confidential information material to the employment. See rule 3-310(E). Since an attorney may represent one current client adverse to another current client with informed written consent when the attorney possesses material confidential information of the consenting client, it follows that such consent may be allowed in some but not all cases where the duty of loyalty is the duty that is implicated. This conclusion is further supported by rule 3-310(C)(1)-(3), which allow informed written consent in connection with other sorts of concurrent client conflicts.

Case law also confirms that a conflict of interest may generally be waived by the persons who are personally interested in the matter. See Flatt, supra, 9 Cal.4th at p. 286 fn. 4; Anderson, supra, 211 Cal. at p. 116; In re Marriage of Friedman (2002) 100 Cal.App.4th 65, 70-71.

3. Disclosure to Each Client

To obtain informed written consent, Attorney must disclose to each client the relevant facts and circumstances and the reasonably foreseeable adverse consequences of waiving any conflicts arising out of Attorney's representation of Prospective Client and service of a document subpoena on Witness Client. Rule 3-310(A)(1). "California law does not require that every possible consequence of a conflict be disclosed for a consent to be valid." Zador Corp. v. Kwan (1995) 31 Cal.App.4th 1285, 1301. A conflict waiver may be valid even though it does not undertake "the impossible burden of explaining separately every conceivable ramification." Maxwell v. Superior Court (1982) 30 Cal.3d 606, 622.

Initially, Attorney must determine whether his duties to Witness Client preclude him from disclosing information to Prospective Client necessary to obtain informed written consent. Specifically, Attorney cannot disclose any confidential information obtained in the representation of Witness Client without Witness Client's informed consent. See Business and Professions Code section 6068(e)(1) and rule 3-100(A). In most situations, the identity of a client is not considered confidential and in such circumstances Attorney may disclose the fact of the representation to Prospective Client without Witness Client's consent. Los Angeles County Bar Association Formal Opn. Nos. 456, 374.

In preparing the disclosure to Prospective Client, Attorney must identify the relevant facts and circumstances (i.e., the fact that the firm represents Witness Client in an unrelated matter). Necessary disclosure includes explaining the nature of the conflict of interest, the purpose of the disclosure, the legal and other benefits and detriments resulting from consenting to representation despite the conflict, and any other facts that could have an important bearing on the client's decision. See Los Angeles County Bar Association Formal Opn. No. 456. In the circumstances addressed here, Attorney may need to make further disclosures to Prospective Client, such as the nature and extent of Partner's relationship with Witness Client.

Attorney must also disclose to Prospective Client the reasonably foreseeable adverse consequences of the firm's ongoing relationship with Witness Client. In this regard, the primary adverse consequence is that, because serving third-party discovery on a current client would violate the duty of loyalty of Attorney's firm to that client, Attorney cannot serve Witness Client with the proposed discovery absent informed written consent from Witness Client, which will require disclosure to Witness Client of the relevant facts and circumstances involved in Prospective Client's litigation. Other reasonably foreseeable adverse consequences include the risk that, because of the firm's ongoing relationship with Witness Client, the duty of loyalty to Prospective Client may conflict with the duty of loyalty to Witness Client, and Prospective Client may be concerned that Attorney could be hesitant to seek documents that Witness Client might consider confidential or sensitive. In addition, Attorney should disclose to Prospective Client the risk that Witness Client will contest the subpoena, and without the consent of Witness Client, Attorney will not be able to pursue enforcement of the subpoena against Witness Client.

In preparing the disclosure to Witness Client, similar considerations concerning client identity, confidential information of Prospective Client, and potential favoritism toward Prospective Client may apply. Specifically, in this circumstance Prospective Client's consent may be required for Attorney to disclose to Witness Client the relevant facts and circumstances involved in Prospective Client's litigation. Attorney also may be required to disclose to Witness Client that the subpoena served on behalf of Prospective Client may request documents that Witness Client might consider confidential or sensitive. In addition, Attorney should disclose to Witness Client the risk that Attorney might be required to pursue enforcement of the subpoena against Witness Client and should seek consent to do so.

4. Attorneys Should Check for Conflicts before Accepting Representation of a Client in any Matter

The California Rules of Professional Conduct prohibit attorneys from accepting or continuing representation of a client without providing written disclosure of certain types of conflicts to a client. Rules 3-310(B), (C) and (E). Unlike the ABA Model Rules of Professional Conduct, the California Rules of Professional Conduct do not address conflict checks by attorneys as part of client representation. The Committee believes that, absent exigent circumstances which require immediate action by the attorney on behalf of the client or the applicability of rule 1-650, the attorney should check for any potential conflicts with those who are adverse and potentially adverse, including reasonably foreseeable parties and witnesses, before accepting representation of a client. See rule 3-310(A)(1). If exigent circumstances prevent performing a conflict check, the attorney should accept representation contingent upon a subsequent conflict check revealing no conflicts, run a conflict check as soon as it is possible to do so and inform the attorney's new client that if such a conflict arises, the attorney may be required to withdraw unless appropriate informed written consent is obtained. The attorney should also refresh conflict checks upon the appearance of new parties and witnesses during the pendency of a representation.

CONCLUSION

Without informed written consent, an attorney may not serve third-party discovery on a current client of the attorney or the attorney's law firm, because doing so is adverse to the interests of the client. To accept the representation, an attorney must seek informed written consent from both clients, disclosing the relevant circumstances and the actual and reasonably foreseeable adverse consequences to the client providing consent.

This opinion is issued by the Standing Committee on Professional Responsibility and Conduct of the State Bar of California. It is advisory only.