AI Answer Summary

A lateral hire conflict check tests whether a lawyer joining your firm brings conflicts with your existing clients. It has to catch three separate problems: the thin information a candidate is allowed to share before joining, screens that fail because they arrive late or are administered informally, and, in a merger, conflicts the firm created itself.

The disclosure rules limit what the check can see to names, a brief summary and whether each matter has closed, and disclosure should wait until substantive discussions have started. A screen has to be in place before the lateral touches a file, and the rule governing screens differs by state.

The point partners most often get wrong is the merger. When two of your clients merge, the resulting conflict is usually treated as thrust upon you. When your firm merges, the conflict is your own act, and courts generally will not let you drop a client to cure it.

What a Lateral Hire Conflict Check Has to Catch

A lateral hire conflict check has to catch three different failures, and most firms prepare for only one of them.

A lawyer changing firms brings every conflict from their prior work. Under ABA Model Rule 1.10, one lawyer's conflict is imputed to every lawyer in the firm unless an exception applies. The check exists to find those conflicts before they become the whole firm's problem.

The first two are process problems. A firm can fix them with discipline and a clear owner. The third is a timing problem, and it has to be solved before the deal is signed, because afterwards the options narrow sharply.

It helps to be clear about what the check is not. It is not the conflicts search a firm runs on every new matter, which asks whether a new client or adverse party collides with the existing book. A lateral check runs the other way round: it takes an entire book of someone else's past work and tests it against yours, usually under time pressure and before the person has even agreed to join.

How to Run a Lateral Hire Conflict Check: Sequence and Timing

Run it in four stages. The stage that decides the outcome is the second, because that is when the firm finds out whether it can take the lateral at all.

Two stages go wrong more often than the others.

Firms move too late at stage two. The decision to screen has to be made while the offer is still negotiable, because some conflicts cannot be screened at all, and in some states screening is limited. A conflict discovered after the lateral starts leaves the firm choosing between a client and a hire it has already announced.

Firms stop too early at stage four. The rule requires certifications at reasonable intervals when the former client asks for them, and again when the screen ends. A screen is a standing obligation for as long as the matter is open. It is not an event on the start date.

One practical instruction covers both. Put stage two on the hiring timeline as a formal gate with a named owner, so that no lateral offer can be finalised until someone has signed that the conflicts analysis is complete.

What a Lateral Candidate Can Disclose Before Joining

The check can only run on information the candidate is allowed to share, and the rules keep that deliberately thin.

The Disclosure Ceiling Under Rule 1.6(b)(7)

ABA Formal Opinion 09-455, issued in October 2009, found that disclosing conflicts information while lawyers move between firms is ordinarily permissible, within limits. The disclosure should go no further than reasonably necessary to detect and resolve conflicts, must not compromise privilege or prejudice a client, and the receiving firm may use it for nothing else.

The ABA then amended Model Rule 1.6 in August 2012, adding paragraph (b)(7). It permits disclosure to detect and resolve conflicts arising from a lawyer's change of employment or from changes in a firm's composition, on the same conditions, and the accompanying commentary says disclosure should wait until substantive discussions about the move have taken place. Comment 13 sets the ceiling: the identity of the persons and entities involved in a matter, a brief summary of the general issues, and whether the matter has ended.

Not every state adopted paragraph (b)(7). Where it has not, the same result may follow under the implied-authorization exception, which is what the ABA opinion relied on before the amendment. Check your own jurisdiction.

When Even a Client Name Is Too Sensitive to Share

Some representations cannot be disclosed even at that level, because the existence of the representation is itself the secret. Commentary on the opinion gives examples: a client planning a hostile takeover, a client contemplating a divorce, a client appearing before a grand jury. Those need the client's consent, or a different route.

Using an Independent Lawyer to Run the Check

Opinion 09-455 endorsed a route most firms never use. Both sides retain an independent lawyer who receives the conflicts information in confidence, runs the analysis, and tells each side whether a conflict exists without revealing what it is. For a large lateral group, or for information too sensitive to exchange directly, it solves a problem the ordinary process cannot.

Ethical Screens for Lateral Hires: What the Rule Requires Beyond a Wall

Most firms treat a screen as walling off one lawyer. The rule also requires notice to the former client and recurring certifications signed by a partner.

Model Rule 1.10(a)(2), added in 2009, prevents a lateral's former-client conflict from being imputed to the new firm if three conditions are met:

• The lawyer is timely screened from any participation in the matter and receives no part of the fee from it
• Written notice goes promptly to the affected former client, describing the screening procedures, stating that the firm and the lawyer comply with the rules, noting that review may be available before a tribunal, and agreeing to respond promptly to inquiries or objections
• The screened lawyer and a partner of the firm certify compliance at reasonable intervals when the former client asks in writing, and again when the screen ends

Two words in that rule decide most of the disputes.

"Timely" means before the lateral sees anything. A screen put in place after the lawyer has already opened the file protects nothing, which in practice means the screen has to exist before the start date rather than being built in the first week.

"Partner" means the certification is a governance obligation someone senior signs for. That is why a screen that exists only as a permissions change in the document system does not meet the rule, however well it restricts access.

A useful test for any firm with open screens: could you produce the notice you sent and the most recent certification you gave, for every screen currently in place? If you could not, what you have is a hope rather than a defence.

Lateral Screening Rules Differ by State

The ABA has permitted lateral screening since 2009, and a good deal of writing on this subject treats that as national practice. Two of the largest legal markets in the country adopted it only in the last two years, and each did so with limits the ABA rule does not contain.

New York's rule is new enough that the guidance is still arriving. The New York City Bar published Formal Opinion 2026-1 in August 2026, explaining when the safe harbour is available, what the notice must contain, when notice may be delayed for confidentiality reasons, and to whom it goes. It also confirms that the rule does not reach litigation matters where the lateral had substantial management or decision-making responsibility, where a conflict waiver may still be needed. Texas adopted its general imputation rule and a definition of "screened" at the same time, and California's version is narrower than both.

Treat this table as an illustration rather than a survey. Check the rule in every jurisdiction where the lateral practised and every jurisdiction where your firm practises, because a screen that is valid in one state can fail in another.

Why Your Conflicts Check Misses Clients You Already Have

Conflicts systems match names. Corporate clients are families, and the gap between the two is where a large share of lateral and merger conflicts slip through.

Here is how it happens, in an example written for this article. A lateral brings a client recorded at their old firm as "Northfield Holdings Inc." Your system holds "Northfield Group" as an existing client, and a live matter adverse to "NFG Logistics," a Northfield subsidiary nobody ever entered. A name search returns nothing. The conflict is real, and it is sitting in plain sight in three different spellings.

A federal court in Seattle dealt with the recorded version of this in Atlantic Specialty Insurance Co. v. Premera Blue Cross, 2016 WL 1615430 (W.D. Wash. 2016). A partner in the firm's Portland office took on a coverage case for a subsidiary of a large carrier and entered the subsidiary into the conflicts system, but not the parent. The subsidiary sent him corporate counsel guidelines saying, in effect, that representing any part of the corporate family meant representing all of it. He still did not enter the parent or the affiliates. The firm's Seattle office later took a case against another subsidiary of the same carrier.

When the carrier moved to disqualify, the firm withdrew in Portland and argued the matters were unrelated. The court disqualified it, and expressed surprise that the partner had not entered complete information into a large firm's sophisticated conflicts system. It also made a point worth quoting to anyone who relies on clients to flag their own affiliates: the rules impose on lawyers, not their clients, the duty to identify potential conflicts.

Laterals and mergers make this worse in a specific way. A lateral's client list was recorded to another firm's conventions. A merger combines two whole databases, each internally consistent, and the join can produce false negatives because the same client now exists under different strings, different entity treatment, and different closing practices.

What fixes it is mapping corporate families before the check runs, and flagging near-matches for a person to decide rather than trusting an exact-match search to catch them.

Law Firm Merger Conflicts: Why You Cannot Drop a Client to Fix Them

When your clients merge, the conflict is usually treated as thrust upon you. When your firm merges, it is your own act, and courts generally will not let you drop a client to cure it.

The rule behind this has the best name in legal ethics. A firm may not drop a client like a hot potato to escape a conflict with another. The phrase comes from Picker International, Inc. v. Varian Associates, Inc., 670 F. Supp. 1363 (N.D. Ohio 1987), affirmed by the Federal Circuit in 1989, and courts use it to stop a firm converting a current client into a former one in order to reach the more forgiving former-client rules. The idea predates the name: the Ninth Circuit made the same point in 1981.

The distinction is not a technicality. Mark Fucile, a former chair of the Washington State Bar Association's ethics committee, notes that the thrust-upon exception applies to client mergers rather than law firm mergers, and that Picker itself was decided against the backdrop of a law firm merger. The DC Bar's Ethics Opinion 272 makes a similar observation: in the cases where disqualification followed, the lawyer had taken an affirmative step, such as initiating a law firm merger, that created the conflict.

There is live debate about the rule's basis. In ABA Formal Opinion 516, issued in 2025, the majority treated it as a judicial remedy grounded in the fiduciary duty of loyalty, while the dissent argued it follows from the rules themselves. For a firm deciding what to do, the practical consequence is the same either way.

That consequence is the most useful instruction in this article. A firm merger has to clear its conflicts before the deal closes. Once it closes, shedding the smaller client to fix a conflict is largely off the table, so conflicts review belongs on the merger timeline as a pre-signing gating item rather than as an integration task for the months afterwards.

One step shrinks the problem considerably, and it is worth doing well before a merger is announced. Closing out files for clients who are unlikely to return, and telling them so, generally converts them into former clients. The hot potato rule does not apply to former clients, and a former-client conflict only arises where the new matter is the same as or substantially related to the old one. A firm that has let years of dormant clients accumulate as nominally current carries every one of them into the combined firm as a potential current-client conflict.

Counsel review. The treatment of merger conflicts, the thrust-upon distinction and the advice on closing files should be reviewed by counsel familiar with the jurisdictions involved.

How Codebridge Builds Conflicts Screening for Lateral Moves

We build the part of the check that fails most often, which is the data.

That means entity resolution across a lateral's client list and your existing database, corporate-family mapping so a subsidiary resolves to its parent, and near-match flagging, so a person decides the ambiguous cases instead of an exact-match search quietly passing them through. For a merger, the same work runs across two entire databases before closing, which is when it still changes what the firm can do.

The approval checkpoint is designed in, with a record of who cleared which match and when. That record also becomes the evidence behind a screen's notice and its certifications.

One workflow goes live in three weeks, wired into your existing conflicts system. Your firm owns the repository, the prompts and the configuration from day one.

We are not your conflicts counsel. Decisions about consent, screening and disqualification stay with lawyers. What we build is the matching and the record underneath those decisions.

The closest reference we can offer, labelled for what it is: Knowledge Cloud, built for a Big Four tax and legal practice, runs an expert review queue with an immutable audit log, so a senior practitioner approves each output before the firm acts on it. A research platform rather than a conflicts system. What it demonstrates is the review and audit pattern.

Our founding team spent more than a decade at KPMG.

If a lateral group or a merger is on your calendar, book a 20-minute call before it signs.