After defending a client on a traffic ticket from an accident, can another lawyer in the same firm later defend the personal-injury claim that the former client brought over the same accident?

Plain-English summary

Law Firm A had represented a client on a traffic ticket issued from an accident. The firm was later asked whether it could accept employment opposing that same former client's personal-injury claim arising out of the same accident, and whether, if it had entered an appearance for the defendant before realizing it had represented the plaintiff on the traffic matter, it had to withdraw on learning that fact.

The committee answered that the firm could not take the civil defense and had to withdraw. It grounded the analysis in Canon 4 (a lawyer should preserve the confidences and secrets of a client) and Rule 4-101, which bars a lawyer from revealing or using a client's confidence or secret, during or after the representation, to the client's disadvantage. The committee reasoned that information gained while representing the client on the traffic citation and negotiating its disposition would involve the same incident and the same factual events on which the later civil suit was based, so defending the civil claim would break the preservation of the former client's confidences and secrets in violation of Rule 4-101. The committee cited ABA Formal Opinion No. 33 (an attorney may not accept litigation against a past client that requires contesting the same issue he previously advocated, nor may a partner do so even if not a partner at the time of the prior litigation) and ISBA EC 4-5. It added that the obligation extends to the firm's employees, associates, and partners, and that once Firm A learned of the conflict it had to withdraw to avoid violating Rule 5-105.

Currency note

This opinion was issued in 1980, under the former Illinois Code of Professional Responsibility and before Illinois adopted the 2010 Rules of Professional Conduct. The ISBA Board of Governors affirmed the opinion in July 2010 as generally consistent with the 2010 Rules (Rule 1.9), while cautioning that the specific standards referenced may differ from the 2010 Rules. 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 Treat this page as historical context, not current guidance.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 or requirement mentioned here.

Common questions

Q: Can a firm defend an injury claim against someone it once defended on a traffic ticket from the same accident?

A: The opinion concluded no; the matters share the same incident and facts, so opposing the former client would breach the duty to preserve his confidences and secrets.

Q: Does it matter that a different lawyer in the firm would handle the civil case?

A: Per the opinion, the duty to preserve confidences extends to the firm's employees, associates, and partners, citing ABA Formal Opinion 33 that even a partner who was not a partner during the prior matter cannot take it.

Q: If the firm entered its appearance before realizing the conflict, must it withdraw?

A: The committee concluded the firm had to withdraw once it learned of the prior representation, to avoid violating Rule 5-105.

Background and rules framework

The opinion applied Canon 4 and Illinois Supreme Court Rules 4-101(a) and (b) (confidences and secrets) and 5-105 (declining or withdrawing from conflicting employment), with EC 4-5 and ABA Formal Opinion No. 33. The Board's 2010 affirmation maps the analysis to current Illinois Rule of Professional Conduct 1.9 (duties to former clients), corresponding to ABA Model Rule 1.9, with imputation under Model Rule 1.10.

Citations and references

Rules of Professional Conduct:

• Canon 4; Illinois Supreme Court Rules 4-101(a), 4-101(b), 5-105; EC 4-5 (applied in the opinion)
• Illinois RPC 1.9 (2010 equivalent per the Board's affirmation)
• MR 1.9 (duties to former clients); MR 1.10 (imputation of conflicts)

Other opinions cited:

• ABA Formal Opinion No. 33: a lawyer (or his partner) may not litigate against a past client on the same issue previously advocated
• ISBA Opinion 701: an obvious conflict situation under Rule 5-105

See also

• ISBA Ethics Op. 753: Adverse to a Former Client in an Unrelated Matter
• ISBA Ethics Op. 698: Public Defenders Representing Co-Defendants
• ISBA Ethics Op. 707: Lay Intermediaries Between Lawyers and Clients
• RI EAP Op. 2005-03: Insurer-Assigned Counsel Must Screen for Adversity Before Representing One Insured Against a Dismissed Former Co-Defendant Client

Source

• Landing page: https://www.isba.org/ethics/opinions/704