Conflicts of Interest Rules

Conflict of interest rules form the ethical backbone of the attorney-client relationship, ensuring loyalty and protecting confidential information. Mastering these rules is not just a professional requirement but a core component of the Multistate Professional Responsibility Examination (MPRE) and state bar exams. Their application governs who you can represent, under what conditions, and how these decisions affect every other lawyer in your firm.

The Foundational Duty of Loyalty to Current Clients

Your duty of loyalty to a current client is nearly absolute. Model Rule 1.7(a) establishes that you are prohibited from representing one client if the representation is directly adverse to another current client. This is true even if the two matters are wholly unrelated. For example, you cannot file a lawsuit against Corporation A on behalf of Client B while simultaneously drafting a contract for Corporation A as a client in an unrelated field.

However, this broad prohibition has a narrow but critical exception. Under Rule 1.7(b), you may proceed with a representation that poses a conflict if you reasonably believe you can provide competent and diligent representation to each affected client, the representation is not prohibited by law, the matter does not involve claims by one client against another in the same litigation, and—most importantly—each affected client gives informed consent, confirmed in writing. This is not a simple waiver; "informed consent" requires you to communicate all relevant circumstances and the material risks of the proposed representation, including the implications of sharing confidential information, so the client can make an informed decision.

Navigating Duties to Former Clients

The duty to former clients is different; it is not a duty of unwavering loyalty but a duty to protect their confidential information. Under Model Rule 1.9, you cannot represent a new client in a matter that is the "same or substantially related" to a matter in which you represented the former client, if the interests of the new client are materially adverse to the former client. The "substantially related" test is the key analysis here. Matters are substantially related if they involve the same transaction or legal dispute, or if there is a substantial risk that confidential factual information from the prior representation would be materially relevant to the new matter.

For instance, if you previously represented a pharmaceutical company in drafting a patent for Drug X, you are likely prohibited from later representing a generic manufacturer seeking to invalidate that same patent—the matters are substantially related because your confidential knowledge of the patent's strengths and weaknesses is directly relevant. The former client’s informed consent, confirmed in writing, can also waive this conflict.

Special Considerations for Prospective Clients

Rule 1.18 bridges the gap between non-clients and full clients. A prospective client is someone who discusses with a lawyer the possibility of forming an attorney-client relationship. Even if they never hire you, you owe them a duty of confidentiality. As with former clients, you cannot later represent a client with interests materially adverse to the prospective client in the same or a substantially related matter. The key difference is that the prohibition here applies only if you received information from the prospective client that could be significantly harmful to them. This rule prevents lawyers from "shopping" for confidential information in brief consultations.

The Doctrine of Imputed Disqualification

Conflicts are often contagious. Under Model Rule 1.10, the conflicts of any lawyer in a firm are imputed to every other lawyer in that firm, with limited exceptions. This means if Lawyer Jones is personally prohibited from representing a client due to a conflict (e.g., a former client conflict), the entire firm is also prohibited. The policy is clear: lawyers in a firm are presumed to share client confidences. The major exception to imputation is for conflicts arising under Rule 1.7 (current client conflicts) or 1.9 (former client conflicts) that are based on a lawyer’s personal interest—not the client’s interest. In such cases, the conflict is not imputed if it does not present a significant risk of materially limiting the firm's representation.

Another critical exception allows a law firm to screen a lawyer who joins the firm from a previous government job (Rule 1.11) or from a previous firm where they acquired a conflict (addressed under specific rules like 1.9, if local jurisdiction permits). Screening involves isolating the conflicted lawyer from any participation in the matter, denying them access to files, and not sharing any fees from the representation. Proper screening can prevent the entire new firm from being disqualified.

Common Pitfalls

1. Misapplying the "Substantially Related" Test: A common error is assuming that because the subject matter is similar (e.g., two real estate transactions), the matters are automatically substantially related. The correct analysis focuses on the specific confidential facts you learned in the first representation and whether they are materially relevant to the second. On an exam, avoid superficial comparisons and dig into the factual nexus.
2. Confusing Consent Requirements: Treating all consent as equal is a major mistake. Consent for a current client conflict under Rule 1.7 requires a higher standard and is harder to obtain than for a former client conflict under Rule 1.9. Remember, you can never consent to representing both sides of the same litigation (e.g., Plaintiff and Defendant) even if they both agree.
3. Overlooking Imputation: Forgetting that a single lawyer's conflict disqualifies the entire firm is a classic bar exam trap. Always ask the follow-up question: "If this lawyer is conflicted, can any lawyer in the firm take the case?" The answer is usually "no," unless a specific screening exception applies and is properly implemented.
4. Failing to Recognize a Prospective Client: Assuming that because someone didn’t pay or sign a retainer they are not owed duties can lead to a violation. The moment a substantive discussion about potential representation occurs, Rule 1.18 duties attach, triggering confidentiality obligations and potential conflicts.

Summary

• The core duty to current clients prohibits representation that is directly adverse, unless all affected clients give informed consent, confirmed in writing, and other stringent conditions are met.
• The duty to former clients prohibits representation in a "substantially related" matter where the new client's interests are materially adverse, unless the former client consents in writing.
• Brief consultations with prospective clients create duties of confidentiality and can trigger disqualification from substantially related adverse matters.
• The principle of imputed disqualification means a conflict for one lawyer in a firm is generally a conflict for the entire firm, with narrow exceptions for properly implemented screening in specific scenarios.
• On the MPRE and bar exam, always identify the correct client status (current, former, prospective), apply the specific rule for that category, and then immediately check for imputation to the rest of the firm.