27. At the hearing, the commissioned officer or the discipline committee, as the case may be, must1° read the citation to the police officer who is the subject of the citation;
2° allow the police officer who is the subject of the citation to change his or her plea;
3° allow the police officer who is the subject of the citation to be heard and to defend himself or herself;
4° accept any evidence considered appropriate and relevant to ensure disclosure of the truth; and
5° call, question and discharge witnesses, if necessary.