Nev. Sup. Ct. R. 3.3
A judge shall not testify as a character witness in a judicial, administrative, or other adjudicatory proceeding or otherwise vouch for the character of a person in a legal proceeding, except when dury summoned.
Nev. Sup. Ct. R. 3.3
COMMENT
[1] A judge who, without being subpoenaed, testifies as a character witness abuses the prestige of judicial office to advance the interests of another. See Rule 1.3. Except in unusual circumstances where the demands of justice require, a judge should discourage a party from requiring the judge to testify as a character witness.
[2] This rule does not apply to bar admissions proceedings or attorney or judicial discipline proceedings. A judge may voluntarily appear and testify as to the character of the bar applicant, attorney, or judge who is the focus of those proceedings.