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 duly summoned.
Ind. Code. Jud. Cond. 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 prohibit judges from writing letters of recommendation in non-adjudicatory proceedings pursuant to Rule 1.3, Comments [2] and [3].
[3] This Rule applies to attorney and judicial disciplinary proceedings, including reinstatements.