Police Act (Cap. 164), article 26

26. In proceedings before the Commissioner or disciplinary board under article 23 - (a) an officer higher in rank than the officer charged shall b e d e t a i l e d t o r e p r e s e n t t h e p r o s e c u t i n g s i d e a n d produce the evidence in support of the charge; (b) the officer charged may defend himself in person, or through the assistance of an advocate, legal procurator or another police officer of his own choice, or a representative of a trade union. Evidence and procedural rules.