Contra firm law isn’t a recognized legal doctrine or a term you’ll find in any bar association’s rulebook. The phrase is borrowed loosely from securities trading, where a “contra firm” is the brokerage on the other side of a trade, and people apply it in two informal ways: to describe opposing counsel’s firm, or to describe the unaffiliated firm you get referred to when your first-choice firm has a conflict of interest and can’t take your case. If someone has mentioned a “contra firm” to you, what they almost certainly mean is one of those two things, and the rules that actually govern the situation are the professional conduct rules on conflicts of interest, screening, and client consent.
Where the Phrase Comes From
“Contra” means against or opposite. In financial services, the contra firm is simply the firm sitting on the other side of a securities transaction. When the word crosses over into legal conversation, it tends to carry one of two meanings. The first is opposing counsel’s firm, the firm representing the party on the other side of your matter. The second is the firm you end up with when a conflict of interest prevents the firm you originally approached from representing you.
Neither usage appears in the American Bar Association’s Model Rules of Professional Conduct or in any state ethics code. Lawyers themselves rarely use the term. What they do use, and what actually governs the situations the phrase gestures at, are the rules on conflicts of interest.
When a Firm Has to Send You Somewhere Else
The scenario where a client is most likely to hear something like “contra firm” is a referral. You contact a law firm, the firm runs a conflict check, and the firm tells you it can’t represent you. In many cases, the firm will point you to another, completely unaffiliated firm that handles similar work. That receiving firm is sometimes what people casually call the contra firm, though there’s no formal label for the relationship.
Referrals of this kind carry their own ethical limits. The referring attorney can’t steer you toward an incompetent or dishonest lawyer, has to be clear that they don’t represent you and can’t give you legal advice, and can’t share in the fees the new firm earns on your matter. The referral has to be made in good faith.
Even if you only had a preliminary conversation with the first firm, that contact creates obligations on the firm’s side. Under the rules on prospective clients, information you shared during an initial meeting is protected, and if what you said could be significantly harmful to you, the firm generally can’t later represent the other side unless it screens off the lawyer you spoke with.1American Bar Association. Rule 1.18 Duties to Prospective Clients
Why the Firm Can’t Just Take Your Case
Every lawyer owes two core duties to every client: loyalty and confidentiality. Loyalty means your lawyer advocates solely for your interests. Confidentiality means what you share stays protected, even after the representation ends. A conflict of interest threatens one or both.
Model Rule 1.7 sets the baseline. A lawyer cannot represent a client if doing so would be directly adverse to another current client, or if there’s a serious risk that the lawyer’s ability to advocate for one client would be limited by obligations to someone else.2American Bar Association. Rule 1.7 Conflict of Interest Current Clients This isn’t limited to opposing parties in a lawsuit. It covers business transactions, negotiations, estate planning where family members have competing interests, and anywhere divided loyalty could affect representation.
And a single lawyer’s conflict doesn’t stay with that lawyer. Under the principle of imputation, when one lawyer at a firm is disqualified from a matter, every other lawyer in that firm is presumed disqualified too.3American Bar Association. Rule 1.10 Imputation of Conflicts of Interest General Rule Lawyers at the same firm share offices, staff, and systems, and the risk of confidential information crossing between them is treated as too high to ignore. That’s why one associate’s old case can block an entire 500-lawyer firm from a matter.
The Two Ways a Firm Can Still Take the Case: Screens and Consent
When imputation would otherwise disqualify the whole firm, there are two mechanisms that can keep the representation alive. One is an ethical screen. The other is written informed consent from the affected client.
An ethical screen, sometimes called an ethical wall, isolates the conflicted lawyer from the rest of the firm’s work on the matter.4American Bar Association. Building Ethical Screens Up to Code It isn’t a separate company or a referral. It’s a set of internal protocols inside one firm designed to prevent any flow of confidential information between the screened lawyer and the team handling the case.
Screens are built mainly for the lateral-hire situation: a lawyer joins a new firm and brings a conflict from a prior job. For current-client conflicts, screens generally don’t do the work. The firm needs written informed consent from every affected client, and even then consent only functions if the lawyer reasonably believes competent representation is still possible for each client, the representation isn’t prohibited by law, and the clients aren’t suing each other in the same proceeding.2American Bar Association. Rule 1.7 Conflict of Interest Current Clients That last condition means some conflicts can’t be waived at all, no matter how willing everyone is.
Former-client conflicts work on similar lines. If your old lawyer’s new firm wants to take a case adverse to you in a related matter, the firm either needs your written consent or has to properly screen the conflicted lawyer. The question is whether the new matter is substantially related to the old one and whether the lawyer picked up confidential information that could hurt you.5American Bar Association. Rule 1.9 Duties to Former Clients
What a Proper Screen Looks Like
If a firm screens a lawyer because of a conflict involving you, you are entitled to know about it. For a screen to be effective, several things have to be in place at once:
- It goes up as soon as the conflict is identified, not after a complaint or court order.4American Bar Association. Building Ethical Screens Up to Code
- The screened lawyer cannot discuss the matter with anyone at the firm working on it, and vice versa.
- The screened lawyer receives no portion of the fees from the conflicted matter.
- The affected former client gets prompt written notice describing the screening procedures, the firm’s compliance measures, and a statement that the client can seek review before a court.3American Bar Association. Rule 1.10 Imputation of Conflicts of Interest General Rule
- File access is restricted, the screened lawyer’s office may be moved, and shared staff may be reassigned.
The notice also has to explain how you can verify compliance, and you can request certifications from both the screened lawyer and a firm partner at reasonable intervals.3American Bar Association. Rule 1.10 Imputation of Conflicts of Interest General Rule If you believe the screen is inadequate for your situation, you can challenge it in court. Courts have disqualified firms despite technically compliant screens where the firm’s small size made genuine information segregation unrealistic.
What to Do If You Receive a Notice or a Consent Request
Read any screening notice carefully. Note the date the screen went up, who is screened, and what the firm says it has done to protect your information. Ask for the periodic compliance certifications the rule entitles you to. If something doesn’t add up, or if the firm handling the matter is small enough that true separation seems implausible, raise it with the court.
If a firm asks for your written consent to a conflict, you are never obligated to give it. Saying no may force the firm to drop one of its clients, but that is the firm’s problem to work out, not yours. Consent should be in writing and should spell out what the conflict is, who the other client is, and what the risks to your representation are. Vague or oral assurances aren’t enough.
Situations Where This Comes Up
As a client or prospective client, the conflict-of-interest machinery tends to surface in a handful of common scenarios:
- A lawyer you previously worked with joins a firm representing your opponent. The new firm should send you written notice explaining how it has screened your former lawyer.3American Bar Association. Rule 1.10 Imputation of Conflicts of Interest General Rule
- You met with a lawyer for a preliminary discussion but didn’t hire them. Later, that lawyer’s firm represents the other side in a related matter. The firm should screen the lawyer who spoke with you.1American Bar Association. Rule 1.18 Duties to Prospective Clients
- Your current firm contacts you to explain that it wants to represent another client whose interests conflict with yours in an unrelated matter. The firm needs your written informed consent.2American Bar Association. Rule 1.7 Conflict of Interest Current Clients
- A firm tells you it can’t take your case and refers you to another firm. The conflict is too severe for screening or consent to resolve, and the receiving firm is unaffiliated.
One boundary worth naming: joint representation. If a firm is representing you together with someone else, say a co-defendant or a business partner, and the two of you develop seriously conflicting interests, the firm usually has to withdraw from representing both of you, not just one. A firm cannot represent two clients who are directly adverse to each other in the same court proceeding, consent or not.6American Bar Association. Rule 1.7 Conflict of Interest Current Clients – Comment If that happens, expect to need new counsel.