Lawyers as Witnesses
A. A lawyer shall not act, or accept employment that contemplates the lawyer's acting, as an advocate on issues of fact before any tribunal if the lawyer knows or it is obvious that the lawyer ought to be called as a witness on a significant issue on behalf of the client, except that the lawyer may act as an advocate and also testify:
1. If the testimony will relate solely to an uncontested issue.
2. If the testimony will relate solely to a matter of formality and there is no reason to believe that substantial evidence will be offered in opposition to the testimony.
3. If the testimony will relate solely to the nature and value of legal services rendered in the case by the lawyer or the lawyer's firm to the client.
4. As to any matter, if disqualification as an advocate would work a substantial hardship on the client because of the distinctive value of the lawyer as counsel in the particular case.
B. Neither a lawyer nor the lawyer's firm shall accept employment in contemplated or pending litigation if the lawyer knows or it is obvious that the lawyer or another lawyer in the lawyer's firm may be called as a witness on a significant issue other than on behalf of the client, and it is apparent that the testimony would or might be prejudicial to the client.
C. If, after undertaking employment in contemplated or pending litigation, a lawyer learns or it is obvious that the lawyer ought to be called as a witness on a significant issue on behalf of the client, the lawyer shall not serve as an advocate on issues of fact before the tribunal, except that the lawyer may continue as an advocate on issues of fact and may testify in the circumstances enumerated in DR 5-102 [1200.21] (B)(1) through (4).
D. If, after undertaking employment in contemplated or pending litigation, a lawyer learns or it is obvious that the lawyer or a lawyer in his or her firm may be called as a witness on a significant issue other than on behalf of the client, the lawyer may continue the representation until it is apparent that the testimony is or may be prejudicial to the client at which point the lawyer and the firm must withdraw from acting as an advocate before the tribunal.