Can a former prosecutor defend a criminal defendant on the same charges the prosecutor personally handled while in the DA's office?

Plain-English summary

The committee was asked whether a former prosecutor may defend an accused on the same charges the lawyer personally and substantially prosecuted while a public officer. The answer is no. The governing provision, DR 9-101(B)(1), bars a lawyer from representing a private client in a matter in which the lawyer participated personally and substantially as a public officer or employee. Unlike DR 5-101 and DR 5-105, this rule contains no informed-consent exception, so the committee treats the conflict as a per se prohibition.

The committee adds a second, independent ground. Under N.Y. State 748, a former prosecutor has a duty to protect the confidences and secrets learned in that role. A former prosecutor may not represent a defendant where doing so would either violate the DR 4-101 duty to protect the former client's (the People's) confidences and secrets, or violate the Canon 7 duty to represent the new client zealously, which would require using those confidences for the defendant's benefit.

The opinion then devotes substantial discussion to the relationship between the Code and the courts. The committee stresses that a violation of the Code does not automatically result in disqualification or civil or criminal sanctions; New York courts have declined to set aside convictions or exclude evidence absent a showing that a conflict "operated on" the defense (citing People v. Abar, People v. Smart, People v. Longtin, and Gidatex v. Campaniello Imports). But the committee draws a sharp line between a court's reluctance to impose litigation remedies and the existence of an ethical breach: conduct that escapes a court sanction may still be subject to professional discipline, because the Code states a minimum standard of conduct independent of trial-taint analysis.

In practice

Under the New York Code as it stood at the time, the opinion holds that the bar on a former prosecutor defending the same charges is categorical: DR 9-101(B)(1) admits no consent exception, so neither the defendant nor the prosecutor's former office can waive it. The committee reinforces that conclusion with the confidentiality and zealous-representation duties under DR 4-101 and Canon 7. It also makes clear that the fact a court might not disqualify the lawyer, or might decline to upset a conviction on conflict grounds, does not make the representation ethical; the disciplinary standard is separate from the courts' "operated on the defense" test.

Common questions

Q: Why can't the defendant just consent to the former prosecutor representing him?

A: Because DR 9-101(B)(1), the rule the committee finds most applicable, contains no informed-consent exception, unlike DR 5-101 and DR 5-105. The committee treats the conflict as per se prohibited.

Q: Is confidentiality a separate problem?

A: Yes. Citing N.Y. State 748, the committee says a former prosecutor must protect confidences and secrets of the People and cannot represent the defendant where doing so would breach DR 4-101 or require using those secrets for the new client under Canon 7.

Q: If a court won't disqualify the lawyer or overturn the conviction, is the representation still unethical?

A: Yes. The committee emphasizes that a court declining to impose disqualification, evidence exclusion, or reversal does not approve the underlying conduct; the Code's minimum standard can be violated even where no court remedy follows.

Q: Does a statute also bear on this conduct?

A: The committee notes, without deciding applicability, that Judiciary Law section 493 makes it a misdemeanor for a former public prosecutor to afterward take part in the defense of a matter he prosecuted.

Background and rules framework

The opinion applies New York's former Code of Professional Responsibility. DR 9-101(B)(1) restricts a former public officer's later representation of a private client in the same matter (the subject now treated by Model Rule 1.11, with the broader former-client principle in Model Rule 1.9). DR 4-101 governs the duty to preserve a former client's confidences and secrets (analogous to Model Rule 1.6). Canon 7 expresses the duty of zealous representation. The committee's central point is structural: DR 9-101(B)(1)'s lack of a consent provision is what makes this conflict non-waivable, in contrast to the consentable conflicts under DR 5-101 and DR 5-105.

Citations and references

Rules of Professional Conduct:

• MR 1.11 (former government officer; successive conflicts); NY DR 9-101(B)(1)
• MR 1.9 (duties to former clients); NY DR 5-105
• MR 1.6 (confidentiality); NY DR 4-101

Statutes:

• N.Y. Jud. Law section 493: misdemeanor for a former public prosecutor to afterward take part in the defense of a matter he prosecuted (cited without determination of applicability)

Cases:

• People v. Abar, 99 N.Y.2d 406 (2003), conviction not set aside where a former-prosecutor conflict did not "operate on" the defense
• People v. Smart, 96 N.Y.2d 793 (2001), same operative-conflict standard
• People v. Longtin, 92 N.Y.2d 640 (1998), defendant must show the conflict in fact affected the defense
• GD Searle & Co. v. Pennie & Edmonds LLP, N.Y.L.J., Jan. 26, 2004 (N.Y. Sup. Ct.), no private right of action to enforce the disciplinary rules
• Gidatex, S.r.L. v. Campaniello Imports, Ltd., 82 F. Supp. 2d 119 (S.D.N.Y. 1999), courts need not exclude evidence obtained in violation of ethical rules

Other opinions cited:

• N.Y. State 748 (2001): a former prosecutor's continuing duty to protect confidences and secrets

See also

• NY State Bar Op. 1257: Former district attorney in a public defender's office
• NY State Bar Op. 1148: Former government lawyer adverse to a former employer
• NY State Bar Op. 874: Part-time prosecutor's representation of criminal defendants
• NY State Bar Op. 1029: Conflicts for government lawyers with prior private clients

Source

• Landing page: https://nysba.org/ethics-opinion-776/