Concept
Bar on Adverse Representation
Prospective client conflicts
Bar on Adverse Representation
Rule 1.18(c) states its conflict test in a single sentence: a lawyer subject to paragraph (b) "shall not represent a client with interests materially adverse to those of a prospective client in the same or a substantially related matter if the lawyer received information from the prospective client that could be significantly harmful to that person in the matter, except as provided in paragraph (d)."1 The lawyer "subject to paragraph (b)" is any lawyer who learned information from a prospective client, including a lawyer whose consultation ended in a refusal and no client-lawyer relationship.2
Paragraph (b) limits what the lawyer may do with the information, and paragraph (c) limits whom the lawyer may represent afterward. The second limit fills a gap the first leaves open. A lawyer who heard one side's account and is then retained by the other side would be working against a person whose weak points the lawyer already knows, and a promise not to use that knowledge gives the person little to rely on. Disqualification removes the lawyer from the position instead. Paragraph (c) also extends a disqualified lawyer's bar to the lawyer's firm unless paragraph (d) supplies a cure.3 This unit treats the bar as personal to the lawyer who received the information, and later sections take up imputation and cure.
The test has two parts, and the lawyer is barred only when both are met. The first looks outward at the new engagement: are the new client's interests materially adverse to the prospective client's, and is the matter the same as, or substantially related to, the one the person consulted about? The second looks back at the consultation: did the lawyer receive information that could be significantly harmful to the prospective client in the matter? That second part is why a person who consulted a lawyer receives less protection than a client does. The subsections below take the two parts in that order.
Adversity and Related Matter
The first two conditions of Rule 1.18(c) describe the new engagement, not the earlier consultation. The new client's interests must be "materially adverse" to those of the prospective client, and the matter must be "the same or a substantially related" one.4 Both must be met before the question of harmful information arises.
Material adversity asks which side of the matter the new client occupies. The paradigm is the opposing party in a lawsuit or a negotiation, where the new client's gain is the prospective client's loss and the lawyer's work would aim at that person's position. The word materially leaves out remote or incidental friction. A new client whose interests run alongside the person's in the matter creates no adversity for paragraph (c) to address.
The second condition ties the new engagement to what the person brought to the lawyer. The identical matter is the easy case. "Substantially related" is harder: it is the element most frequently litigated and the cause of the most confusion, and the text of Rule 1.9 does not define it but leaves the definition to Comment [3].5 Rule 1.18(c) uses the same phrase for prospective clients,6 so the working definition is the one in Comment [3]. 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 of the kind normally obtained in the earlier work would materially advance the new client's position in the later matter.7
For a prospective client, the consultation takes the place of the earlier representation, so the question is whether the facts a person would normally give a lawyer when consulting about the first matter would help the new client in the second. Courts evaluate the factual bases of the two matters by asking what information and facts would typically be disclosed in such a relationship. One leading summary calls the test today, in large measure, a judgment whether the confidences are at risk of being turned against the person who gave them.8 Without the limit to same or related matters, any brief consultation would block the lawyer from every later engagement for anyone adverse to the person, including matters in which nothing the person said could matter.
The first thing to settle on an exam is whether the new matter is the one the person brought, because the rest of the analysis depends on it.
The risk-based branch of the test does its work between those two poles. Comment [3] to Rule 1.9 gives two pairings from former-client practice. A lawyer who represented a businessperson and learned extensive private financial information may not then represent that person's spouse in a divorce, even though a divorce is a different matter from business advice. A lawyer who secured environmental permits for a shopping center may not represent neighbors opposing the rezoning of the property on environmental grounds, but may defend a tenant of the completed center against eviction for nonpayment of rent.11 In each pairing the matters carry different labels, and the question is whether the earlier information would help the new client. Financial facts advance a spouse's divorce position and permit facts advance an environmental challenge, but permit facts do nothing for a landlord's rent claim. The same reasoning applies to a person who consulted a lawyer about business finances before the spouse arrives asking for a divorce, because the facts that person would share in that consultation are the facts the divorce turns on.
Meeting both outward conditions does not finish the analysis, and failing the matter condition does not release the lawyer from everything. A related, adverse matter triggers the bar only if the lawyer received information that could be significantly harmful to the person, which is the subject of the next subsection. A lawyer who takes an unrelated matter has avoided paragraph (c), but paragraph (b) still forbids the lawyer to use or reveal what the person said.12 Students lose points both by treating any later conflict as disqualifying and by assuming that an unrelated matter frees the lawyer to use the person's information.
Significantly Harmful Information
The second requirement of Rule 1.18(c) looks back at the consultation itself. Even when the new client is materially adverse and the matter is the same or substantially related, the lawyer is barred only if the lawyer received information from the prospective client that could be significantly harmful to that person in the matter.14 The first two requirements describe the new engagement, and this one describes what the lawyer took away from the meeting. It separates the prospective-client rule from the former-client rule, and examiners test it often. A student who finds a related matter and stops has skipped the question the rule treats as decisive.
Rule 1.9 bars a lawyer from taking a matter adverse to a former client when the matters are the same or substantially related, and it is built to avoid any exploration of the specific confidential information the lawyer held during the earlier representation. Rule 1.18(c) instead permits an evaluation of the importance and harmful quality of the confidential information the lawyer in fact obtained from the prospective client.15 The rules diverge because the encounters diverge. A lawyer who represented someone over time is assumed to hold the confidences that kind of work normally produces, and making the former client prove which ones the lawyer holds would force the client to expose them in the proceeding meant to protect them. A consultation is a different encounter. Discussions with a prospective client usually are limited in time and depth, so the lawyer may have learned little that could hurt the person, and the rule gives the person some but not all of the protection a client receives.16
The New Jersey Supreme Court applied its own version of the rule in O Builders v. Yuna Corp. That version, like the ABA text, bars adverse representation when the lawyer received information from the former prospective client that could be significantly harmful to that person in the matter.17 The court required harm that "must be prejudicial in fact to the former prospective client within the confines of the specific matter in which disqualification is sought," and it called the determination "exquisitely fact-sensitive and -specific."18 Each phrase narrows the inquiry. Harm that is prejudicial in fact is real rather than hypothetical, so a court asks what the person actually said. Harm confined to the specific matter means a sensitive disclosure counts only if it could be used against the person in the dispute where disqualification is sought. And because the determination is fact-specific, no kind of consultation is automatically in or out.
The lawyer controls much of this factual question. A lawyer's encounter with a prospective client may lead to disqualification from representing any other client, including an existing one, in the same or a substantially related matter, so the lawyer has good reason to arrange the consultation in a way that limits the information received. The lawyer need not stop the person from sharing all substantive information, which may be impractical if the lawyer is to judge whether representation is appropriate. The aim is to control receipt of information that is significant and harmful.19 The protection also belongs only to a genuine prospective client, someone who reasonably expected the lawyer might undertake the representation.20
The order of the intake meeting often separates a lawyer who is barred from one who is free.
The threshold has limits. A lawyer who received nothing significantly harmful is free to take the adverse engagement but still may not use or reveal what the person said, because paragraph (b) continues to apply.23 A lawyer who did receive harmful information is not barred permanently either, since paragraph (d) offers routes to cure, which a later section covers.
The ABA text is the baseline, and an answer that names no jurisdiction should apply the significantly harmful standard. Some states word the threshold differently, so a student working under a particular state's version should read its harm phrase closely. A Florida version, for example, bars adverse representation when the lawyer received information from the prospective client that "could be used to the disadvantage of that person in the matter."24 That wording drops the word significantly and speaks of disadvantage, so it reads as a lower threshold, one that information too modest to be significantly harmful might still meet.