37. An appointed officer who is appointed to investigate a case concerning the relevant conduct of a designated person who is a member of the police support staff shall, as soon as is practicable (without prejudicing his or any other investigation of the matter or the preparation of any report under regulation 29(1))—
(a)in all cases give the designated person concerned in writing the caution set out in paragraph 1 of Schedule 2; and
(b)where he reasonably believes that the presence of any object, substance or mark found—
(i)on the person of the designated person concerned, or
(ii)in or on his clothing, footwear or otherwise in his possession, or
(iii)in any place in which he was present at a time material to the subject matter of the report, complaint or allegation,
may be attributable to the designated person’s having breached the code of ethics, inform the designated person concerned that he so believes and give him in writing the caution set out in paragraph 2 of Schedule 2; and
(c)where he reasonably believes that the presence of the designated person concerned at a place at or about the time a breach of the code of ethics was alleged to have been committed may be attributable to the involvement of the designated person concerned in that breach, inform him that he so believes and give him in writing the caution set out in paragraph 3 of Schedule 2.