Rule 3.7 - Lawyer as Witness(a) A lawyer shall not act as advocate at a trial in which the lawyer is likely to be a necessary witness unless:(1) the testimony relates to an uncontested issue;(2) the testimony relates to the nature and value of legal services rendered in the case; or(3) disqualification of the lawyer would work substantial hardship on the client; or(4) except as otherwise provided by statute.(b) A lawyer may act as advocate in a trial in which another lawyer in the lawyer's firm is likely to be called as a witness unless precluded from doing so by Rule 1.7 or Rule 1.9.SDCL app TO CHAPTER 16-18 r. 3.7