(1) A notice of proposed adverse action issued by the department pursuant to the marijuana laws shall be served upon the licensee by sending a copy of the notice to the licensee by electronic means to the email address on file with the department. 

(2) Service shall be considered complete upon transmission but is not effective if the department learns that the notice did not reach the licensee, in which case the department will proceed with service of notice provided in (3).

(3) If a licensee has previously opted out of receiving department communications by electronic means, the notice shall be served by sending a copy of the notice to the licensee by certified mail to the mailing address on file with the department. Whenever the department serves a notice via certified mail:

(a) service shall be considered complete three days after mailing the notice;

(b) service shall not be considered incomplete because of refusal to accept delivery of the notice.

(4) A licensee must respond to the department in writing within 20 days of service of the notice of proposed adverse action. Failure to respond will result in enforcement of the administration action proposed in the notice.