A prior representation can create a serious conflict, but a witness’s name in a former office file does not automatically disqualify the lawyer or the entire office. The key questions include who personally represented the witness, whether the matters are substantially related, whether protected information could matter to this defense, and whether the conflict limits investigation, cross-examination or advice.
California Rule of Professional Conduct 1.9 restricts representation of a new client whose interests are materially adverse to a former client in the same or a substantially related matter, unless the former client gives informed written consent. It also protects information learned in the prior representation. Rule 1.10 addresses when a lawyer’s conflict is imputed to others in the firm and includes conditions and exceptions. Ethics duties and the criminal court’s constitutional inquiry are related but not identical. (California Rules of Professional Conduct, Rules 1.9–1.10)
In People v. Williams, the California Supreme Court rejected an automatic conflict based only on another public defender’s former representation of prosecution witnesses. The assigned lawyer had not represented those witnesses and did not possess their confidential information. The court examined the actual representation and whether confidential information could affect the defense. A conclusory office statement alone does not resolve every case. (People v. Williams)
What facts should be raised?
Tell current counsel which witness is involved and what you know about the earlier representation, without asking for or sharing the former client’s protected communications. Counsel can assess who handled the prior matter, what information the lawyer may have learned, and whether it could reasonably affect a defense decision. Relevant limits may involve what counsel can investigate, ask on cross-examination, or disclose in a motion; simply identifying an old file does not establish that any particular information is relevant or usable.
If the issue may affect representation, raise it promptly with counsel so it can be evaluated before a strategic choice or trial. The appropriate response depends on the actual conflict and the record. Courts may need to examine a potential conflict before trial, but neither disqualification nor a particular remedy follows automatically from prior office contact. People v. Noriega addresses a specific appointed-counsel replacement record and should not be treated as a universal rule for every retained lawyer or firm. (People v. Noriega)
For general information about California criminal trials, see the firm’s practice page. For help assessing a possible former-client witness conflict, contact the Law Offices of David S. Chesley at (800) 755-5174.