Rule 1.9 Duties to Former Clients

(a) A lawyer who has formerly represented a client in a matter shall not thereafter 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 each affected client gives informed consent, confirmed in writing.

(b) A lawyer shall not knowingly represent a person in the same or a substantially related matter in which a firm with which the lawyer formerly was associated had previously represented a client: (1) whose interests are materially adverse to that person; and (2) about whom the lawyer had acquired information protected by Rules 1.6 and 1.9(c) that is material to the matter, unless each affected client gives informed consent, confirmed in writing.

(c) A lawyer who has formerly represented a client in a matter or whose present or former firm has formerly represented a client in a matter shall not thereafter: (1) 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 (2) reveal information relating to the representation except as these Rules would permit or require with respect to a client.

(d) For purposes of this rule, matters are “substantially related” if (1) the lawyer’s representation of the current client will injure or damage the former client in connection with the same transaction or legal dispute in which the lawyer previously represented the former client; or (2) there is a substantial risk that confidential factual information as would normally have been obtained in the prior representation of the former client would materially advance the current client’s position in the subsequent matter.