Source: Professional Responsibility Blog: ABA issues new opinion on lawyers passive investment in law firms that include non-lawyer owners

Thanks to Alberto Bernabe for the tip:

A lawyer may passively invest in a law firm that includes nonlawyer owners (“Alternative Business Structures” or “ABS”) operating in a jurisdiction that permits ABS entities, even if the lawyer is admitted to practice law in a jurisdiction that does not authorize nonlawyer ownership of law firms. To avoid transgressing Model Rule 5.4 or other Model Rules and to avoid imputation of conflicts under Model Rule 1.10, a passively investing lawyer must not practice law through the ABS or be held out as a lawyer associated with the ABS and cannot have access to information protected by Model Rule 1.6 without the ABS client’s informed consent or compliance with an applicable exception to Rule 1.6 adopted by the ABS jurisdiction.