(a) Except as law may otherwise expressly permit, an attorney who has formerly served as a public officer or employee of the government:

(1) is subject to Rule 19-301.9 (c) (1.9); and

(2) shall not otherwise represent a client in connection with a matter in which the attorney participated personally and substantially as a public officer or employee, unless the appropriate government agency gives its informed consent, confirmed in writing, to the representation.

(b) When an attorney is disqualified from representation under section (a) of this Rule, no attorney in a firm with which that attorney is associated may knowingly undertake or continue representation in such a matter unless:

(1) the disqualified attorney is timely screened from any participation in the matter and is apportioned no part of the fee therefrom; and

(2) written notice is promptly given to the appropriate government agency to enable it to ascertain compliance with this Rule.

(c) Except as law may otherwise expressly permit, an attorney having information that the attorney knows is confidential government information about a person acquired when the attorney was a public officer or employee, may not represent a private client whose interests are adverse to that person in a matter in which the information could be used to the material disadvantage of that person. As used in this Rule, the term “confidential government information” means information that has been obtained under governmental authority and which, at the time this Rule is applied, the government is prohibited by law from disclosing to the public or has a legal privilege not to disclose and which is not otherwise available to the public. A firm with which that attorney is associated may undertake or continue representation in the matter only if the disqualified attorney is timely screened from any participation in the matter and is apportioned no part of the fee therefrom.

(d) Except as law may otherwise expressly permit, an attorney currently serving as a public officer or employee:

(1) is subject to Rules 19-301.7 (1.7) and 19-301.9 (1.9); and

(2) shall not:

(A) participate in a matter in which the attorney participated personally and substantially while in private practice or non-governmental employment, unless the appropriate government agency gives its informed consent, confirmed in writing; or

(B) negotiate for private employment with any person who is involved as a party or as an attorney for a party in a matter in which the attorney is participating personally and substantially, except that an attorney serving as a law clerk to a judge, other adjudicative officer or arbitrator may negotiate for private employment as permitted by Rule 19-301.12 (b) (1.12) and subject to the conditions stated in Rule 19-301.12 (b) (1.12).

(e) As used in this Rule, the term “matter” includes:

(1) any judicial or other proceeding, application, request for a ruling or other determination, contract, claim, controversy, investigation, charge, accusation, arrest or other particular matter involving a specific party or parties, and

(2) any other matter covered by the conflict of interest rules of the appropriate government agency.