Can a small public defender's office represent a defendant when a prosecution witness is a former client of the office, and can consent or office size change the answer?

Plain-English summary

The committee took up three questions from a small public defender or legal aid office: whether it may represent a criminal defendant when the office formerly represented a prosecution witness in an unrelated criminal matter; whether informed consent of each client can absolve any resulting disqualification; and whether, absent consent, knowledge of the closed file is imputed to every lawyer in the small office. Distinguishing its simultaneous-representation precedents (N.Y. State 592 and 290), the committee framed this as a successive, former-client conflict. The core duty is the continuing obligation under DR 4-101 to preserve a former client's confidences and secrets after the representation ends (EC 4-6). The committee held that, even where no concrete confidence can be identified, a later representation against a former client is impermissible if there is a "substantial relationship" between the current and prior matters that creates the likelihood or appearance that relevant confidences were obtained, adopting the courts' and Second Circuit's "common law of disqualification" as an accurate reading of the Code and adhering to its multi-factor test in N.Y. State 303 and 139.

The committee rejected artificial devices used to sidestep the conflict, such as limiting cross-examination of the former-client witness, relying on an "independent source" for impeachment material, or having a different lawyer conduct the cross-examination, finding them inconsistent with the current client's right to competent and zealous representation under Canons 6 and 7 and with the right to a fair trial. On consent, the committee held that because this is a Canon 4 confidentiality conflict, the informed consent of each client, knowingly given after full disclosure, can purge it under DR 4-101(C)(1), while cautioning that constitutional decisions such as Wheat v. United States give trial courts an independent duty to ensure a fair trial and may lead courts not to accept consent. On imputation, it applied the general rule that one disqualified lawyer's knowledge is imputed to the whole office, extending that to public defender and legal aid offices, so that in a small office all members are disqualified if any member is, though it noted case law suggesting a large legal aid office may be able to negate the conflict. The committee answered the first question no, and the second and third questions yes.

Currency note

This opinion was issued in 1989, under New York's former Code of Professional Responsibility, which New York replaced with the Rules of Professional Conduct in 2009 (where former-client conflicts appear as Rule 1.9 and imputation as Rule 1.10). Subsequent rule amendments or later opinions may have changed the analysis. Treat this page as historical context, not current guidance. Verify against current rules before relying on any specific rule, deadline, or requirement mentioned here.

Common questions

Q: Can a public defender's office defend a client when a prosecution witness is a former client?

A: Not ordinarily. The committee answered no, unless the prior matter is wholly unrelated and no relevant confidences or secrets were obtained, so that there is no substantial relationship between the two matters.

Q: Can client consent cure the conflict?

A: Yes. The committee held that, as a Canon 4 confidentiality conflict, the knowing informed consent of each client after full disclosure can purge it under DR 4-101(C)(1), while noting courts may independently decline to accept the consent.

Q: If there is no consent, is the whole office disqualified?

A: Yes, in a small office. The committee held that one lawyer's disqualifying knowledge is imputed to every lawyer in the office, though it noted case law suggesting a large legal aid office may negate the conflict.

Q: Do workarounds like limiting cross-examination solve the problem?

A: No. The committee held that devices such as limiting cross-examination, using an "independent source" for impeachment, or having a different lawyer cross-examine the former client do not cure the conflict and compromise the current client's right to competent, zealous representation.

Background and rules framework

The opinion interpreted DR 4-101 (preserving a client's confidences and secrets, continuing after the representation) and its consent exception DR 4-101(C)(1), together with DR 5-105 and the then-newly adopted DR 5-108(A) on former-client conflicts, and the imputation principle applied to public defender offices. The closest Model Rule analogues are Rule 1.9 (duties to former clients), Rule 1.10 (imputation of conflicts within a firm), and Rule 1.6 (confidentiality).

Citations and references

Rules of Professional Conduct:

• MR 1.9 (duties to former clients; the substantial-relationship test)
• MR 1.10 (imputation of conflicts of interest)
• MR 1.6 (confidentiality of information)
• NY DR 4-101; DR 4-101(B); DR 4-101(C)(1); DR 5-105; DR 5-108(A)

Cases:

• Wheat v. United States, 486 U.S. 153 (1988): a trial court's independent duty to ensure a fair trial despite a defendant's consent
• Evans v. Artek Systems Corp., 715 F.2d 788 (2d Cir. 1983): the substantial-relationship test for former-client disqualification

Other opinions cited:

• N.Y. State 303 (1973); N.Y. State 139 (1970): the multi-factor test for successive representation
• N.Y. State 502 (1979): the Committee follows the courts' substantive law of disqualification, including imputation in legal aid offices
• N.Y. State 492 (1978): informed consent can absolve a successive-representation conflict

See also

• NY State Bar Op. 615: Vicarious disqualification in a conflict of interest
• NY State Bar Op. 628: Former-client conflicts and loyalty after termination
• NY State Bar Op. 638: Newly elected DA prosecuting a former-firm client

Source

• Landing page: https://nysba.org/opinion-605/