32 C.F.R. § 776.46 – Attorney as witness.

(a) A covered attorney shall not act as advocate at a trial in which the covered attorney is likely to be a necessary witness except when:
1. (1) The testimony relates to an uncontested issue;
2. (2) The testimony relates to the nature and quality of legal services rendered in the case; or
3. (3) Disqualification of the covered attorney would work substantial hardship on the client.
(b) A covered attorney may act as advocate in a trial in which another attorney in the covered attorney's office is likely to be called as a witness, unless precluded from doing so by § 776.26 or § 776.28 of this part.
(c) [Reserved]