§ Rule 4-1.9 Conflict of Interest; Former Client
Rule 4-1.9. Conflict of Interest; Former Client
A lawyer who has formerly represented a client in a matter shall not thereafter:
(a) represent another person in the same or a substantially related matter in which that person's interests are materially adverse to the interests of the former client unless the former client gives informed consent;
(b) use information relating to the representation to the disadvantage of the former client except as these rules would permit or require with respect to a client or when the information has become generally known; or
(c) reveal information relating to the representation except as these rules would permit or require with respect to a client.