ER 8.5. Jurisdiction
(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 not admitted in this jurisdiction is also subject to the disciplinary authority of this jurisdiction if the lawyer provides or offers to provide any legal services in this jurisdiction. A lawyer may be subject to the disciplinary authority of both this jurisdiction and another jurisdiction 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 of the jurisdiction in which the tribunal sits, unless the rules of the tribunal provide otherwise; and
(2) for any other conduct, the rules of the jurisdiction in which the lawyer's conduct occurred, or, if the predominant effect of the conduct is in a different jurisdiction, the rules of that jurisdiction shall be applied to the conduct. A lawyer shall not be subject to discipline if the lawyer's conduct conforms to the rules of a jurisdiction in which the lawyer reasonably believes the predominant effect of the lawyer's conduct will occur.
 In modern practice lawyers frequently act outside the territorial limits of the jurisdiction in which they are licensed to practice, either in another state or outside the United States. In doing so, they remain subject to the governing authority of the jurisdiction in which they are licensed to practice. If their activity in another jurisdiction is substantial and continuous, it may constitute practice of law in that jurisdiction. See ER 5.5.
 If the rules of professional conduct in the two jurisdictions differ, principles of conflict of laws may apply. Similar problems can arise when a lawyer is licensed to practice in more than one jurisdiction.
 Where the lawyer is licensed to practice law in two jurisdictions which impose conflicting obligations, applicable rules of choice of law may govern the situation. A related problem arises with respect to practice before a federal tribunal, where the general authority of the states to regulate the practice of law must be reconciled with such authority as federal tribunals may have to regulate practice before them.