Supreme Court Rules
Rule 4 - Rules Governing the Missouri Bar and the Judiciary - Rules of Professional Conduct
Publication / Adopted Date:
August 19, 1994
Client-Lawyer Relationship - Former Judge, Arbitrator, Mediator or Other Third-Party Neutral
Revised / Effective Date:
July 1, 2007
RULE 4-1.12: FORMER JUDGE, ARBITRATOR, MEDIATOR OR OTHER THIRD-PARTY NEUTRAL
(a) Except as stated in Rule
, 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 parties to the proceeding give informed consent, confirmed in writing.
(b) A lawyer shall not negotiate for employment with any person who is involved as a party or as lawyer 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 law clerk to a judge or other adjudicative officer may negotiate for employment with a party or lawyer involved in a matter in which the clerk is participating personally and substantially, but only after the lawyer has notified the judge or other adjudicative officer.
(c) If a lawyer is disqualified by Rule
, no lawyer in a firm with which that lawyer is associated may knowingly undertake or continue representation in the matter unless:
(1) the disqualified lawyer is timely screened from any participation in the matter and is apportioned no part of the fee therefrom; and
(2) written notice is promptly given to the parties and any appropriate tribunal to enable them to ascertain compliance with the provisions of this Rule 4-1.12.
(d) An arbitrator selected as a partisan of a party in a multimember arbitration panel is not prohibited from subsequently representing that party.
(Adopted Aug 7, 1985, eff. Jan. 1, 1986. Amended March 1, 2007, eff. July 1, 2007.)
 This Rule 4-1.12 generally parallels Rule
. The term "personally and substantially" signifies that a judge who was a member of a multimember 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. The fact that a former judge exercised administrative responsibility in a court 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. Compare the Comment to Rule
. The term "adjudicative officer" includes such officials as judges pro tempore, referees, special masters, hearing officers, and other parajudicial officers and also lawyers who serve as part-time judges. Compliance Canons A(2), B(2) and C of the Model Code of Judicial Conduct provide that a part-time judge, judge pro tempore, or retired judge recalled to active service may not "act as a lawyer in any proceeding in which he served as a judge or in any other proceeding related thereto." Although phrased differently from this Rule 4-1.12, those Canons correspond in meaning.
 Like former judges, lawyers who have served as arbitrators, mediators, or other third-party neutrals may be asked to represent a client in a matter in which the lawyer participated personally and substantially. This Rule 4-1.12 forbids such representation unless all of the parties to the proceedings give their informed consent, confirmed in writing. See Rule
. Other law or codes of ethics governing third-party neutrals may impose more stringent standards of personal or imputed disqualification. See Rule
 Although lawyers who serve as third-party neutrals do not have information concerning the parties that is protected under Rule
, they typically owe the parties an obligation of confidentiality under law or codes of ethics governing third-party neutrals. Thus, Rule
provides that conflicts of the personally disqualified lawyer will be imputed to other lawyers in a law firm unless the conditions of Rule 4-1.12 are met.
 Requirements for screening procedures are stated in Rule
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 disqualified.
 Notice, including a description of the screened lawyer's prior representation and of the screening procedures employed, generally should be given as soon as practicable after the need for screening becomes apparent.