N.D. R. Prof. Cond. 4.4
In representing a client, a lawyer shall not use means that have no substantial purpose other than to delay or to embarrass or burden a third person, or use methods of obtaining evidence that violate the legal rights of such a person.
N.d. R. Prof. Cond. 4.4
Comment
[1] Responsibility to a client requires a lawyer to subordinate the interests of others to those of the client, but that responsibility does not imply that a lawyer may disregard the rights of third persons. For example, a lawyer shall not: ask questions or otherwise allude to matters not reasonably believed to be relevant with the intention of degrading a witness or another; act on a client's behalf only to harass or maliciously injure another; or make comments to or investigate jurors or members of the venire where those acts are calculated merely to harass, embarrass, or vex jurors or members of the venire.
.Reference: Minutes of the Professional Conduct Subcommittee of the Attorney Standards Committee on 09/20/85 and 10/18/85; Minutes of Joint Committee on Attorney Standards on 06/08/04, 04/08/05, 06/14/05. .