Written by attorneys · grounded in primary & secondary sources — see below
The location where a lawyer's conduct has its primary regulatory impact. For conduct not connected to a pending tribunal matter, this location determines which jurisdiction's rules of professional conduct govern the lawyer's actions. A lawyer who reasonably believes the predominant effect will occur in a particular jurisdiction and conforms conduct to that jurisdiction's rules receives protection from discipline.
Sources & Authorities
How it applies
Common Examples
2
Remote Compliance Advice for Out-of-State Plants
Lena, admitted only in State A, works from her home office in State B. She advises Apex Manufacturing, headquartered in State C, on workplace safety policies that will be implemented solely at Apex's plants in State C under State C regulations. Lena structures her advice to comply with State C rules because she reasonably believes the predominant effect of her work will occur there. When a disciplinary agency reviews the matter, State C's rules govern and Lena faces no discipline.
National Advertising Disclaimers Drafted Remotely
Luis, licensed only in State M, works from his home office in State N. He drafts advertising disclaimers for Dusk Outlet, a national retail chain headquartered in State O. The disclaimers will appear on a website and in stores across multiple states, with marketing decisions and rollout coordinated from State O. Luis conforms his drafting to State O rules because he reasonably believes the predominant effect will occur there. State N's disciplinary authority applies State O's rules and does not discipline Luis.
Put it into practice
Test Yourself
10
Practice Questions5
· 2 primary sources
Select any source to read its text and confirm it supports the definition.
Model Codes
Course Outlines
Common questions
Frequently Asked
4
What happens when a lawyer reasonably believes the predominant effect of conduct will occur in a particular jurisdiction?+
The lawyer is protected from discipline if the conduct conforms to the rules of that jurisdiction. This safe harbor applies even if another jurisdiction later asserts authority over the same conduct.
Supporting sources
How does the predominant effect test interact with the default rule that conduct is governed by the jurisdiction where it occurs?+
The default rule points to the place of conduct, but the predominant effect test overrides it when the main impact lies elsewhere. The test ensures any single course of conduct is subject to only one set of ethics rules.
Supporting sources
Does the client's headquarters location alone determine predominant effect?+
No. The analysis focuses on where the lawyer's conduct occurs and where its primary impact is felt, including where policies or documents will be implemented and where regulatory consequences arise. Headquarters may be relevant but is not controlling by itself.
Supporting sources
Can a lawyer avoid discipline by conforming to rules of a jurisdiction with only minor contacts?+
No. The reasonable-belief requirement demands an objective basis tied to the actual impact of the conduct. A belief lacking such grounding does not trigger the safe harbor.
Supporting sources
Professional ResponsibilityRegulation of the legal profession · Multijurisdictional practiceMPREFoundational