Same or Substantially Related Matter

Same or Substantially Related Matter

Rule 1.9(a) does not bar every adverse engagement against a former client. It reaches only an engagement in “the same or a substantially related matter,” and that phrase is the rule’s second element.¹ The first element, whether the person the lawyer would oppose is a former client, is settled above. This one asks how the new engagement connects to the old. “Same” explains itself: the lawyer now sits on the other side of the matter the lawyer handled for the former client. “Substantially related” explains nothing, because the rule’s text never defines it.

The definition lives in Comment [3], and that is why the comment carries unusual weight here. In some cases the comments are extremely important, and this is one of them.² The comment treats matters as substantially related if the lawyer may have learned confidential information of the former client that could be used to that client’s detriment in representing the new client.³ A student who works a problem from the rule’s text alone has no test to apply. The Model Rules are also only suggestions until a state’s courts adopt them, so a state’s version of the rule or the comment may read differently.⁴

Four lenses follow, and one problem may call for more than one. The first covers a lawyer who opposes the former client in the very matter the lawyer handled. The second develops the dominant test, the risk that confidential information from the old work will serve the new client. The third covers a loyalty-based route that needs no secrets: a lawyer may not attack work the lawyer did for the former client. The fourth marks where relatedness stops.

The Same Matter

The simplest connection needs no test. When the lawyer now opposes a former client in the very matter the lawyer handled, the matter itself supplies the relatedness, and nobody has to estimate what the lawyer learned or whether the lawyer is undoing earlier work.⁷ Both duties that survive an engagement are at stake at once: the duty to protect the former client’s confidential information from disclosure or misuse, and the duty not to attack the lawyer’s own work.⁸ A change of sides in a single matter is the clearest case the rule reaches.

The court in Doe v. Perry Community School District faced a change of sides of this kind. A lawyer who had first served as the plaintiffs’ trusted attorney in a lawsuit against a school district later landed at the firm defending the district in that same lawsuit. As the court put it, the new firm “now stands as adversary against the [plaintiffs] in the very litigation in which [the lawyer] first served as their trusted attorney.”⁹ The lawyer apparently took no direct part in the district’s defense, yet the firm set up no screen until after the plaintiffs moved to disqualify it.¹⁰ Whether a firm can cure a lawyer’s conflict by screening is a question of imputation, which this unit sets aside. For the matter element, the lawsuit itself was the connection.

State v. Tensley reaches the same element by another path. Here the switch happened inside the case. The court reversed the mother’s conviction, saying the lawyer had been “allowed to switch clients and take an adversarial role against” his now-former client, “culminat[ing] in the ghastly unrestrained” cross-examination of the mother.¹¹ In that cross-examination, any competent lawyer would seek to impose blame by “emphasizing the mother as dominant custodian for the child’s care.”¹² The adverse work occurred in the very case in which the lawyer had represented her, so no inference about what he knew was needed.

The two decisions show two ways to meet the same element. In Doe the lawyer changed employers, and the former clients found their old lawyer’s new firm across the courtroom; they answered with a motion to disqualify. In Tensley the harm surfaced at trial, and an appellate court later reversed the former client’s conviction. In both, the lawyer stood on the other side of the very litigation in which the lawyer had served the former client.

Florida’s version of the rule states the working question in a comment: whether the lawyer “was so involved in the matter that the subsequent representation can be justly regarded as a changing of sides in the matter in question.”¹³ That question explains the line the comment draws. A lawyer who recurrently handled a type of problem for a former client may later represent another client in a wholly distinct problem of that type, even when the new engagement takes a position adverse to the former client.¹⁴ A lawyer who helped build a particular transaction, by contrast, stands on the other side of it. The comment is Florida’s, and so is the consent wording of Florida’s rule, which ends “unless the former client gives informed consent” without the Model Rule’s added requirement that the consent be confirmed in writing.¹⁵

The usual error is to read “same matter” as “same client” or “same field.” The question is whether the dispute or transaction the lawyer now opposes is the one the lawyer handled. A clear same-matter conflict also stays curable, because the former client may give informed consent, confirmed in writing.¹⁶

Confidential Information Test

Most successive-conflict problems pair two matters that look different on their face, so the same-matter route leaves them open. The question then becomes whether the old work left the lawyer holding something useful against the former client. By far the most common fact pattern involves that kind of access to the old client’s confidential information, which might “materially advance the [new client’s] position in the subsequent matter.”¹⁸ Comment [3] states the standard: matters are substantially related “if they involve the same transaction or legal dispute or if there otherwise is a substantial risk that confidential factual information as would normally have been obtained in the prior representation would materially advance the client’s position in the subsequent matter.”¹⁹ The first alternative is the same-matter route. The second is the confidential information test, and in the great majority of cases it decides the question.²⁰

The test is objective. It asks what a lawyer handling the earlier matter would normally have learned, and the lawyer’s own recollection of the file does not control. A court evaluates the factual bases of the two engagements by asking “what information and facts ought to have been or would typically be disclosed in such a relationship,” and then asks whether information of that kind would matter to the adverse client’s position now.²¹ The Restatement frames the same idea as a substantial risk that representing the new client will involve using information acquired in representing the former client, unless that information has become generally known.²² Professors Hazard and Hodes and attorney Jarvis summarize the result as “in large measure a judgment as to whether the former client’s confidences are at risk of being turned against him.”²³ The design makes sense, because a client forced to prove what it told the lawyer would have to expose the very confidences the rule protects. Two phrases carry the weight: “normally” ties the information to what such a client would typically share, and “materially advance” requires that it help the new client in the new matter.

Comment [3] teaches the test through paired examples. A lawyer who represented a businessperson and learned extensive private financial information about that person may not then represent the person’s spouse in seeking a divorce.²⁴ The bodies of law differ, yet a divorce turns on what the couple owns and earns, and the lawyer who worked inside the businessperson’s finances holds facts that would materially advance the spouse’s position on those questions. A treatise embellishes the illustration with an offshore twist: the lawyer learned of the husband’s Cayman Islands entity during the earlier work. The wife may know nothing of the entity, and she may be entitled to discovery on whether he holds offshore accounts. The information is still “confidential factual information” the lawyer obtained in the prior representation, so the divorce is substantially related to the earlier work.²⁵

The second illustration puts both outcomes side by side. A lawyer who earlier secured environmental permits for a shopping center is precluded from representing neighbors who oppose rezoning of the property on environmental grounds, yet is not precluded, on substantial-relationship grounds, from defending a tenant of the completed center against eviction for nonpayment of rent.²⁶ The former client, the property, and the adversity are the same in both engagements, so none of those facts decides anything. The information each dispute would call for does. Permit work puts the lawyer inside the environmental side of the project, and the neighbors would fight on that ground. An eviction for unpaid rent turns on the lease and the payment history, which the permit work would not touch.

The test also governs lawyers who serve spouses in turn. Hurley v. Hurley belongs to that line, and the example drawn from Florida Bar v. Dunagan supplies the details. A lawyer represented a husband and wife in acquiring a business, then represented the husband in their divorce. Because the business was an asset of the marital estate, the lawyer would have had to argue that the husband deserved a larger share of it. The lawyer failed to show that the wife consented, and it was shown that the lawyer used personal information to the detriment of the former client, the wife. The Florida Bar found several rule violations and recommended suspension.²⁷ Dunagan involved actual misuse, but a former client invoking Rule 1.9(a) need not prove any. The test asks about risk.

Two presumptions keep the inquiry workable. When the earlier matter was litigation, a Restatement comment says it “will be conclusively presumed that the lawyer obtained confidential information about the issues involved in the litigation,” so the former client need not identify a single confidence.²⁸ Within a firm, Rule 1.10 presumes that confidential information held by one lawyer has been shared with every other lawyer there; that second presumption belongs to imputed disqualification and is set aside here.²⁹

Jurisdictions word the test differently, and the wordings converge.³⁰ One court describes a “factual context” approach. The focus is not on whether confidential information was disclosed but on whether the matters are related in some substantial way, and “[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.”³¹ That phrasing looks to shared facts, while Comment [3] looks to the risk that confidential factual information would materially advance the new client’s position. Both ask what the old work taught the lawyer and whether the new client could profit from it. An answer should use a jurisdiction’s own formulation when the problem names one and Comment [3] when it does not.

The lawyer’s knowledge counts even if the former client’s adversary could obtain the same information in discovery. Rule 1.6(a) forbids revealing “information relating to the representation of a client” without consent or another permitted basis, and that duty reaches well beyond privileged communications.³² A lawyer who handled the earlier matter also knows what to ask for and where to look, an advantage no discovery request can hand over.³³ In the offshore illustration, a wife who could eventually find the entity through discovery still gains something real from a lawyer who already knows it exists, and the rule denies her that gain.

Step four does the work, because it forces a comparison of the issues in the two matters. Overlap in the parties, the property, or the industry does not satisfy it, which is why the permit lawyer may defend the tenant and may not represent the neighbors.

Attacking Prior Work

The confidential information test resolves most successive-conflict problems, but not all. Comment [3] frames relatedness around secrets, and a smaller group of cases involves no secret at all.³⁵ The question in those cases is whether the lawyer, now working for someone else, is being asked to take apart something the lawyer built for the former client. That second route to relatedness rests on the surviving duty of loyalty.

The loyalty duty that outlasts an engagement is narrow. Some duties end with the representation, such as the duty of reasonable care to pursue the client’s objectives. Others persist: the duty to protect the former client’s confidential information, and the duty not to attack, on behalf of a new client, work the lawyer performed for the former one.³⁶ The second duty has a plain rationale. A client who hires a lawyer to obtain a trademark registration or to draft a contract or will pays for a product meant to withstand challenge, and relies on its author to stand behind it. A lawyer who later argues for a new client that the product is invalid leaves the former client defending, against its own lawyer, the work it paid for. No confidence needs to change hands for that harm to occur, because the attack is made openly in the new client’s pleading or brief.

Brennan's, Inc. v. Brennan's Restaurants, Inc. isolates the loyalty route. A lawyer represented a family restaurant business and, while the family was in harmony, obtained a trademark for it. After the family split into competing businesses, the lawyer, now acting for one side, argued that the mark was invalid. The case did not involve a threat to confidential information, because the family members and their entities had shared information during the time of harmony. The only basis for disqualifying the lawyer was the attack on the trademark the lawyer had previously obtained, and that was enough.³⁷

The same logic governs lawyers who draft. A lawyer who has represented a client in drafting a document, such as a contract or will, cannot later represent another person in challenging the legality or efficacy of the document or in contesting the former client’s conduct under it.³⁸ A lawyer who wrote a will therefore cannot act for a relative who wants it set aside as invalid, because the lawyer would be arguing that the instrument the lawyer drafted failed. The rule’s second half widens the bar from attacks on the document to disputes in which the former client’s performance under it is the target. As with every application of Rule 1.9(a), informed consent from the former client, confirmed in writing, can lift the bar, and the consent that matters is the former client’s.³⁹

The will contest and the slip-and-fall suit both put the lawyer against a former client. What separates them is the argument the new client needs the lawyer to make. In the will contest the argument is that the lawyer’s own instrument fails, while in the negligence suit the lawyer’s earlier document never comes up. A student who finds that no secrets are at risk may stop there and call the matters unrelated, which misses the pattern in Brennan’s. The opposite error treats any later suit against a client for whom the lawyer once drafted something as an attack on that work. The loyalty route applies only when the new engagement requires the lawyer to say that the earlier product is invalid or ineffective, or to contest the former client’s conduct under it.

The loyalty route is not stated the same way everywhere. The Model Rules look to the acquisition of confidential information, and the Restatement adds a prohibition on attacking work performed for the former client.⁴⁰ Restatement § 132 states both a loyalty-based and a confidentiality-based test in its text, and the result in Brennan’s is now recognized there.⁴¹ Most substantial-relationship disputes still turn on the former client’s confidentiality interest, so treat the loyalty route as the exception to spot when a lawyer’s own earlier product is under attack.

Limits on Relatedness

Without edges, relatedness would swallow the rule, because a lawyer who once served a client would be shut out of every later dispute with it. The Restatement builds one edge into its definition: a matter is substantially related when there is “a substantial risk that representation of the present client will involve the use of information acquired in the course of representing the former client, unless that information has become generally known.”⁴³ Together with the wording of the test and Florida’s comment, that definition yields three limits. General familiarity with a client does not by itself satisfy the test. Information that has become generally known does not count. And recurring work on one type of problem does not bar a wholly distinct problem of that type.

The limits share one idea. The rule is calibrated to the risk of a real advantage drawn from the former client’s confidential facts, and each limit marks a place where that advantage is missing. The limits decide only whether Rule 1.9(a) bars the engagement. The lawyer’s separate duties to protect the former client’s confidential information from disclosure and adverse use stay in force whichever way the answer comes out.⁴⁴

The test’s wording does the first piece of work. It asks for confidential factual information that would “materially advance” the new client’s position, and a lawyer’s general sense of how the former client operates is not that.⁴⁵ The tenant example shows the point. The lawyer knows the developer equally well in the neighbors’ engagement and the tenant’s, yet only the neighbors’ is barred, because the tenant’s rent history lies outside anything the permit work produced. A long relationship therefore raises the question of what the lawyer learned without answering it.

The second limit sits in the Restatement’s closing clause, which excludes information that has become generally known.⁴⁶ Confidentiality protects secrets. Once a fact is common knowledge, the new client can use it with or without the lawyer, so the lawyer’s participation adds nothing. Florida’s prohibition on using information against a former client carves out the same exception.⁴⁷ The exception is narrower than it sounds. A fact that an adversary could eventually extract from the former client in discovery is not thereby generally known, because the duty of confidentiality reaches beyond privileged material and the lawyer who handled the earlier matter knows what to ask for.⁴⁸

The public deficit and the private payment plan came from the same file, and only the first had left it. The public fact cannot support relatedness and the private one can, so sorting a lawyer’s knowledge into what is common and what is not is itself a step in the analysis.

The third limit comes from a comment to Florida’s version of the rule, so it is Florida’s gloss and not Model Rule text. The comment says that a lawyer who recurrently handled a type of problem for a former client is not precluded from later representing another client in a “wholly distinct problem of that type,” even though the new engagement takes a position adverse to the former client.⁴⁹ Repetition builds skill and not secrets. A lawyer who has closed home sales for a builder knows how such deals are done, but each sale is its own transaction with its own terms and buyer, and what the lawyer knows about the others says little in confidence about this one. The comment’s guiding question marks the boundary: whether the lawyer was so involved in the matter that the new work is “justly regarded as a changing of sides in the matter in question.”⁵⁰

The three limits are easy to state and harder to apply where general familiarity shades into insider knowledge. Those are the close cases.

The case is close because the lawyer’s knowledge could be either of two things. It could be a sense of how defense counsel handle such suits, which any experienced litigator has and which stays within general familiarity. It could also be confidential factual information about this client’s internal assessments and decision-making, shared on the understanding that it would stay private, which would materially advance the new client’s position under the Comment [3] standard.⁵¹ The inquiry is in large measure a judgment about whether the former client’s confidences are at risk of being turned against it, and reasonable courts weighing the same facts can land on opposite sides.⁵² A strong exam answer on such facts identifies the hinge, argues both directions, and commits to a conclusion. A flat declaration either way gives up credit.