(A) The board may refuse to renew or may suspend or revoke a certificate upon proof that the applicant is guilty of fraud, deceit, gross negligence, incompetency or misconduct in relation to his duties a sanitarian.

(B) Before the board may suspend, revoke or refuse to renew a certificate of registration it shall set the matter for a hearing before the board, and at least 20 days prior to the date set for hearing, it shall give written notices of the charges made and the date and place of the hearing to the accused. Service of the notice may be made by personal service or by sending it by registered mail to the last known business address of the accused. The accused shall have the opportunity to be heard in person and by counsel. An audio recording of the hearing shall be kept and a transcript thereof filed with the board.