Rule 1.12

(a) Except as stated 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, judicial staff attorney or law clerk to such a person* or as an arbitrator, mediator, or other third-party neutral, unless all parties to the proceeding give informed written consent.*

(b) A lawyer shall not seek employment from any person* who is involved as a party or as lawyer for a party, or with a law firm* for a party, in a matter in which the lawyer is participating personally and substantially as a judge or other adjudicative officer or as an arbitrator, mediator, or other third party neutral. A lawyer serving as a judicial staff attorney or law clerk to a judge or other adjudicative officer may seek employment from a party, or with a lawyer or a law firm* for a party, in a matter in which the staff attorney or clerk is participating personally and substantially, but only with the approval of the court.

(c) If a lawyer is prohibited from representation by paragraph (a), other lawyers in a firm* with which that lawyer is associated may knowingly* undertake or continue representation in the matter only if:

(1) the prohibition does not arise from the lawyer's service as a mediator or settlement judge;

(2) the prohibited lawyer is timely screened* from any participation in the matter and is apportioned no part of the fee therefrom; and

(3) written* notice is promptly given to the parties and any appropriate tribunal* to enable them to ascertain compliance with the provisions of this rule.

(d) An arbitrator selected as a partisan of a party in a multimember arbitration panel is not prohibited from subsequently representing that party.

Comment

[1] Paragraphs (a) and (b) apply when a former judge or other adjudicative officer, or a judicial staff attorney or law clerk to such a person,* or an arbitrator, mediator, or other third-party neutral, has personally and substantially participated in the matter. Personal participation includes both direct participation and the supervision of a subordinate's participation, as may occur in a chambers with several staff attorneys or law clerks. Substantial* participation requires that the lawyer's involvement was of significance to the matter. Participation may be substantial* even though it was not determinative of the outcome of a particular case or matter. A finding of substantiality should be based not only on the effort devoted to the matter, but also on the importance of the effort. Personal and substantial* participation may occur when, for example, the lawyer participated through decision, recommendation, or the rendering of advice on a particular case or matter. However, a judge who was a member of a multi-member court, and thereafter left judicial office to practice law, is not prohibited from representing a client in a matter pending in the court, but in which the former judge did not participate, or acquire material confidential information. The fact that a former judge exercised administrative responsibility in a court also does not prevent the former judge from acting as a lawyer in a matter where the judge had previously exercised remote or incidental administrative responsibility that did not affect the merits, such as uncontested procedural duties typically performed by a presiding or supervising judge or justice. The term "adjudicative officer" includes such officials as judges pro tempore, referees, and special masters.

[2] Other law or codes of ethics governing third-party neutrals may impose more stringent standards of personal or imputed disqualification. (See rule 2.4.)

[3] Paragraph (c)(2) does not prohibit the screened* lawyer from receiving a salary or partnership share established by prior independent agreement, but that lawyer may not receive compensation directly related to the matter in which the lawyer is personally prohibited from participating.