Rules of Professional Conduct
Rule 8.5: Disciplinary Authority; Choice of Law
(a) Disciplinary Authority. A lawyer admitted to practice in this jurisdiction is subject to the disciplinary authority of this jurisdiction, regardless of where the lawyer’s conduct occurs. A lawyer may be subject to the disciplinary authority of both this jurisdiction and another jurisdiction where the lawyer is admitted for the same conduct.
(b) Choice of Law. In any exercise of the disciplinary authority of this jurisdiction, the Rules of Professional Conduct to be applied shall be as follows:
(1) For conduct in connection with a matter pending before a tribunal, the rules to be applied shall be the rules of the jurisdiction in which the tribunal sits, unless the rules of the tribunal provide otherwise, and
(2) For any other conduct,
(i) If the lawyer is licensed to practice only in this jurisdiction, the rules to be applied shall be the rules of this jurisdiction, and
(ii) If the lawyer is licensed to practice in this and another jurisdiction, the rules to be applied shall be the rules of the admitting jurisdiction in which the lawyer principally practices; provided, however, that if particular conduct clearly has its predominant effect in another jurisdiction in which the lawyer is licensed to practice, the rules of that jurisdiction shall be applied to that conduct.
 Paragraph (a) restates long-standing law.
Choice of Law
 A lawyer may be potentially subject to more than one set of rules of professional conduct which impose different obligations. The lawyer may be licensed to practice in more than one jurisdiction with differing rules, or may be admitted to practice before a particular court with rules that differ from those of the jurisdiction or jurisdictions in which the lawyer is licensed to practice. In the past, decisions have not developed clear or consistent guidance as to which rules apply in such circumstances.
 Paragraph (b) seeks to resolve such potential conflicts. Its premise is that minimizing conflicts between rules, as well as uncertainty about which rules are applicable, is in the best interest of both clients and the profession (as well as the bodies having authority to regulate the profession). Accordingly, it takes the approach of (i) providing that any particular conduct of an attorney shall be subject to only one set of rules of professional conduct, and (ii) making the determination of which set of rules applies to particular conduct as straightforward as possible, consistent with recognition of appropriate regulatory interests of relevant jurisdictions.
 Paragraph (b) provides that as to a lawyer’s conduct relating to a matter pending before a tribunal the lawyer shall be subject only to the rules of professional conduct of that tribunal. As to all other conduct, paragraph (b) provides that a lawyer licensed to practice only in this jurisdiction shall be subject to the rules of professional conduct of this jurisdiction, and that a lawyer licensed in multiple jurisdictions shall be subject only to the rules of the jurisdiction where he or she (as an individual, not his or her firm) principally practices, but with one exception: if particular conduct clearly has its predominant effect in another admitting jurisdiction, then only the rules of that jurisdiction shall apply. The intention is for the latter exception to be a narrow one. It would be appropriately applied, for example, to a situation in which a lawyer admitted in, and principally practicing in, State A, but also admitted in State B, handled an acquisition by a company whose headquarters and operations were in State B of another similar such company. The exception would not appropriately be applied, on the other hand, if the lawyer handled an acquisition by a company whose headquarters and operations were in State A of a company whose headquarters and main operations were in State A, but which also had some operations in State B.
 If two admitting jurisdictions were to proceed against a lawyer for the same conduct, they should, applying this rule, identify the same governing ethics rules. They should take all appropriate steps to see that they do apply the same rule to the same conduct, and in all events should avoid proceeding against a lawyer on the basis of two inconsistent rules.
 The choice of law provision applies to lawyers engaged in transnational practice, unless international law, treaties or other agreements between competent regulatory authorities in the affected jurisdictions provide otherwise.