Concept
Why Former Clients Stay Protected
Rule 1.9(a): Adverse representation against a former client in the same or a substantially related matter
Adverse Representation Against Former Clients
Why Former Clients Stay Protected
Rule 1.9(a) of the Model Rules of Professional Conduct provides that “[a] lawyer who has formerly represented a client in a matter shall not thereafter represent another person in the same or a substantially related matter in which that person's interests are materially adverse to the interests of the former client unless the former client gives informed consent, confirmed in writing.”1 The engagement has ended, the work is done, and the lawyer takes no more instructions from that client. The rule still binds. Why should a lawyer owe anything to a client the lawyer no longer represents?
Some duties end with the engagement, and others cannot. A lawyer who has finished a matter no longer owes a duty of reasonable care in pursuing the client’s objectives.2 A client who confided in the lawyer, however, cannot watch what the lawyer does next, and the confidence would be worth little if it lapsed on the last day of the engagement. The protection therefore has to operate through the lawyer’s later choices about whom to represent.
The protection is also narrow. Forbidding a lawyer ever to act against a former client would serve no practical or principled purpose when the representation is long past and the current matter bears no resemblance to the prior work.3 Rule 1.9(a) therefore reaches only new matters that are the same as, or substantially related to, the old one, and the former client may lift even that bar by consenting.4
Two duties carry the protection past the end of the engagement, and they differ in strength. The duty to protect the former client’s confidential information is the stronger: the primary purpose of the former-client rule is to guard against adverse use of that information to the advantage of a current client. The duty of loyalty survives only to the extent of forbidding the lawyer from undermining the very work performed in the earlier representation, and a lawyer’s fidelity to a former client grows more attenuated as time passes.5 The next two subsections take these duties in that order. The later sections follow the rule’s elements in the order a lawyer would check them: whether the person is a former client, whether the matters are related, whether the adversity is material, and whether the former client has consented.
Confidentiality Outlasts the Engagement
Confidentiality does most of the work behind Rule 1.9(a). A lawyer must protect a former client’s confidential information from disclosure (Rule 1.6(a)) and from adverse use (Rule 1.8(b)), and both duties persist after the lawyer-client relationship ends.6 Rule 1.9(c) then states the ongoing duty directly: whatever new work the lawyer takes, the lawyer may not use confidential information to the disadvantage of a former client.7
The duty survives because clients must be able to rely on it. The lawyer’s promise of confidentiality remains “as good as gold,” qualified only in rare circumstances, such as a client who persists along a wrongful path or presents some other potential for great harm.8 A promise that expired with the engagement would not deserve that description, and a former client has no way to monitor the lawyer once the matter closes. The protection therefore works through the lawyer’s own choices about whom to represent, which is why the primary purpose of the former-client rule is to protect against adverse use of the past client’s confidential information to the advantage of a current client.9
Rule 1.9(a) guards against the risk of misuse and does not wait for proof that misuse occurred. The former client need not show that the lawyer revealed anything. Under the “factual context” approach, the focus is not whether confidential information was disclosed but whether the matters are related in some substantial way, because “[i]f the two matters have common facts, the attorney is in a position to receive confidential information which possibly could be used to the detriment of the former client in the later proceeding.”10 The approach also has a practical logic: a former client forced to prove disclosure would have to expose the very confidences the rule protects. What makes two matters related is the subject of a later section. The point here is that the rule presumes risk and asks for no proof of leakage.
Consider a lawyer who handled business and tax matters for a husband and, in doing so, learned confidential facts about his finances, including a Cayman Islands entity. His wife later asks the same lawyer to represent her in a divorce. Business and tax work may seem unrelated to a divorce, but the lawyer has access to confidential information that might “materially advance the [new] client’s position in the subsequent matter,” and the wife may have no idea the entity exists.11 Nothing in these facts says the lawyer revealed a word, and nothing needs to. The consent that could lift the bar belongs to the former client, the husband, and not to the wife who wants to hire the lawyer.12
The two scenes isolate the fact that matters. In the divorce, the old work left the lawyer holding information with real value against the former client in the new matter; in the lease dispute, it left nothing of the kind. The rule therefore does not make every adverse engagement suspect. It attaches when knowledge from the old work could be put to use in the new one, and it requires no proof that the knowledge was used. When analyzing a successive-conflict problem, resist asking whether the lawyer actually disclosed or exploited anything. The better question is what the old engagement taught the lawyer and whether the new client could profit from it at the former client’s expense.
Loyalty Survives Only in Part
Loyalty is the second duty that survives the engagement, in much smaller form. A client should not have to worry that a lawyer will turn around and attack work the lawyer performed for that client while representing someone new.14 The duty of loyalty therefore persists only to the extent of forbidding the lawyer from undermining the very work performed in the earlier representation.15 Jurisdictions formulate the substantial-relationship test differently: the Model Rules look to the acquisition of the old client’s confidential information, and the Restatement adds a prohibition on attacking work performed for the former client.16
The surviving duty is small because loyalty and confidentiality age differently. While an engagement lasts, the conflict rules both guarantee the lawyer’s undivided loyalty and keep the client’s confidential information from being disclosed or used for anyone else’s advantage.17 After the engagement, a lawyer’s fidelity to the former client becomes more attenuated as time passes, while protection against adverse use of confidences remains the primary purpose of the former-client rule.18 A client whose matter is over no longer relies on the lawyer’s judgment, so little loyalty remains to protect beyond the finished work product. A secret, by contrast, can keep its power to injure long after the matter ends.
That difference explains why the successive-conflicts rule is narrower than the concurrent-conflicts rule. It prohibits only materially adverse representation of the new client in a matter that is the same as, or substantially related to, the lawyer’s work for the old client.19 A current client may object to adverse work even in a matter wholly unconnected to the lawyer’s engagement; a former client holds only the residue of that protection. Treating every former client like a current one would apply the strictest duty after the dependence that justifies it has ended, and it would add little protection, because an unrelated matter endangers neither the former client’s secrets nor its finished work.
The loyalty route to a violation appears in Brennan’s, Inc. v. Brennan’s Restaurants, Inc. A lawyer had obtained a trademark for a family restaurant business during a period when the family’s interests were united. When the family later divided its business interests, the lawyer continued to represent one side and argued in litigation that the trademark was invalid. The court held that by attacking the work he had done for the former client, the lawyer breached a duty of loyalty. The only basis for disqualification was therefore his attack on the trademark he had previously obtained, and the Restatement now recognizes that result in § 132(1) and comment d(ii).20 The lawyer’s earlier job was to secure the mark; arguing for its invalidity asked a court to undo what the former client had engaged him to obtain.
Adversity alone therefore does not trigger Rule 1.9(a). The rule reaches adverse work only when the new matter is the same as, or substantially related to, the old one.21 The two surviving duties supply two routes to that relatedness: the confidentiality route asks whether the lawyer holds information from the old work that could advance the new client’s position, and the loyalty route, illustrated by Brennan’s, asks whether the new work attacks the old. An exam question that shows a lawyer suing a former client invites a finding of violation on adversity alone. Ask first how the old and new matters connect; the sections that follow define that connection.