The board may, on a verified complaint of any person setting forth facts which, if proven, would constitute grounds for refusal, suspension, nonrenewal, or revocation of a license, investigate the actions of any person holding or claiming to hold a license. Before taking the adverse action, the board shall, at least ten days before the date set for the hearing, give written notice to the subject of the adverse action of any charges made and shall afford that person an opportunity to be heard in person or by counsel on the matter. The written notice may be served by personal service or by registered mail. If service cannot be made by personal service or registered mail, then service may be made by publication in the county of residence specified by the person in the person’s last communication with the board. At the time and place fixed in the notice, the board shall conduct the hearing on the charges. Both the accused person and the complainant are entitled to ample opportunity to present in person or by counsel, statements, testimony, evidence, and argument pertinent to the charges or to any defense. The board may continue the hearing from time to time.