Rule 1.12 Former Judge, Arbitrator, Mediator, or Other Third-Party Neutral (a) Except as stated in Rule 2.4(b) and in paragraph (d), a lawyer shall not represent anyone in connection with a matter in which the lawyer participated personally and substantially as a judge or other adjudicative officer or law clerk to such a person or as an arbitrator, mediator or other third-party neutral, unless all