21.—(1) The misconduct officer shall be selected by the deputy chief constable or, if regulation 17(2)(b) is applicable, the nominated officer.
(2) The misconduct officer shall be–
(a)a constable of the police force concerned or, if the chief constable of another police force is requested by the deputy chief constable and agrees to provide an investigating officer, a constable of that other police force; and
(b)a constable of at least the rank of superintendent.
(3) The misconduct officer shall not be–
(a)a chief constable;
(b)a deputy chief constable;
(c)the inquiry officer;
(d)any constable who the deputy chief constable or, if regulation 17(2)(b) is applicable, the nominated officer considers is or appears to be a material witness to the complaint, report or allegation which has been received; and
(e)any other constable who the deputy chief constable or, if regulation 17(2)(b) is applicable, the nominated officer considers is or appears to be an interested party.