Can a criminal defense lawyer represent a defendant when the key eyewitness is a former client whose confidential information could be used to impeach him?

Plain-English summary

A part-time prosecutor sought a formal opinion about a defense lawyer's continued representation of a murder defendant. The only eyewitness to the killing, and the key witness for both the State and the defense, was a former client whom the defense lawyer had previously represented in a DUI matter. The questions were whether that prior representation created an actual conflict, whether the former client could be compelled to reveal what he considered privileged so the court could assess the conflict, whether the defense lawyer could remain in the case in any way, and whether co-counsel who had recently entered the case was tainted by the conflict.

The Disciplinary Commission answered that the defense lawyer has a disqualifying conflict of interest. It explained there is a presumption that, during the prior representation of the witness, the lawyer obtained confidential information, and that "confidential information" under the Rules of Professional Conduct is broader than the attorney-client evidentiary privilege, extending to all information about a client acquired during the representation. Under Rule 1.9(b), the lawyer cannot adversely disclose a former client's confidential information. Because the lawyer admitted knowing the witness's criminal history and the facts of the DUI offense, and because impeaching or attacking a witness's credibility is a disadvantageous use of such information, the real risk of disclosure (which can be inadvertent in the trial setting) creates a true conflict requiring withdrawal. The opinion stressed that the rule is violated not only when confidential information is actually used, but whenever there is a real risk of disclosure.

On the second question, the opinion concluded the former client cannot be compelled to reveal past attorney-client communications to determine whether a present conflict exists, since requiring disclosure would destroy the confidentiality in the very process of protecting it (citing Wolfram's Modern Legal Ethics). On the third, it concluded that a disqualified lawyer cannot remain in the case in any capacity, because any continued involvement would perpetuate the risk of unauthorized disclosure. On the fourth, it concluded co-counsel could continue only if no confidential information about the former client had actually been communicated to him: because co-counsel came from a separate firm (so the presumption of shared confidences that applies within a firm did not apply), he could remain absent proof that he acquired actual knowledge of the confidential information, and he represented that nothing had been shared.

Currency note

This opinion was issued in 1995, before the 2002 Ethics 2000 revisions to the ABA Model Rules of Professional Conduct and Alabama's subsequent amendments to its Rules of Professional Conduct. 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 defense lawyer represent a defendant when the key witness is the lawyer's former client?

A: The opinion concluded the lawyer is disqualified where the lawyer is presumed to hold confidential information about the former-client witness that could be used to impeach him, creating a true conflict requiring withdrawal.

Q: Does the conflict require proof that confidential information would actually be used?

A: No. The opinion concluded the rule is violated whenever there is a real risk of disclosure, which in a trial setting can be inadvertent as well as intentional; actual use is not required.

Q: Can the former client be made to reveal the confidences to test the conflict?

A: No. The opinion concluded the former client cannot be compelled to reveal past attorney-client communications, because doing so would lose the confidentiality in the very process of attempting to protect it.

Q: Is co-counsel from a different firm automatically disqualified too?

A: No. The opinion concluded the presumption of shared confidences applies within a firm but not to co-counsel from separate firms, so co-counsel may remain unless he actually acquired the confidential information.

Background and rules framework

The opinion interprets Rule 1.9(b) of the Alabama Rules of Professional Conduct (Model Rule 1.9, duties to former clients), which precludes adverse use or disclosure of a former client's confidential information. It applies the broader Rules definition of "confidential information" (all information about a client acquired during the representation, wider than the evidentiary privilege) and the firm-level presumption of shared confidences, distinguishing co-counsel from separate firms. The analysis draws on Wolfram's Modern Legal Ethics on why a former client need not reveal confidences to obtain disqualification.

Citations and references

Rules of Professional Conduct:

• Model Rule 1.9 / Ala. R. Prof. C. 1.9(b) (duties to former clients; no adverse disclosure of confidential information)

Other references:

• Wolfram, Modern Legal Ethics, § 7.4.3, p. 369 (1986)

See also

• AL Ethics Op. 1995-10: Prosecutor vs. Sibling Defender
• AL Ethics Op. 1994-13: Lawyer May Not Represent a Client Adverse to a Former Client

Source

• Landing page: https://www.alabar.org/office-of-general-counsel/formal-opinions/1995-07/
• Original PDF: https://www.alabar.org/assets/2019/02/1995-07-1.pdf

Original opinion text

Full opinion text unavailable from the official source; see the linked source above for the complete text.