(1)In this Part references to a complaint are references (subject to the following provisions of this section) to any complaint about the conduct of a person serving with the police which is made (whether in writing or otherwise) by—
(a)a member of the public who claims to be the person in relation to whom the conduct took place;
(b)a member of the public not falling within paragraph (a) who claims to have been adversely affected by the conduct;
(c)a member of the public who claims to have witnessed the conduct;
(d)a person acting on behalf of a person falling within any of paragraphs (a) to (c).
(2)In this Part “conduct matter” means (subject to the following provisions of this section, paragraph 2(4) of Schedule 3 and any regulations made by virtue of section 23(2)(d)) any matter which is not and has not been the subject of a complaint but in the case of which there is an indication (whether from the circumstances or otherwise) that a person serving with the police may have—
(a)committed a criminal offence; or
(b)behaved in a manner which would justify the bringing of disciplinary proceedings.
(3)The complaints that are complaints for the purposes of this Part by virtue of subsection (1)(b) do not, except in a case falling within subsection (4), include any made by or on behalf of a person who claims to have been adversely affected as a consequence only of having seen or heard the conduct, or any of the alleged effects of the conduct.
(4)A case falls within this subsection if—
(a)it was only because the person in question was physically present, or sufficiently nearby, when the conduct took place or the effects occurred that he was able to see or hear the conduct or its effects; or
(b)the adverse effect is attributable to, or was aggravated by, the fact that the person in relation to whom the conduct took place was already known to the person claiming to have suffered the adverse effect.
(5)For the purposes of this section a person shall be taken to have witnessed conduct if, and only if—
(a)he acquired his knowledge of that conduct in a manner which would make him a competent witness capable of giving admissible evidence of that conduct in criminal proceedings; or
(b)he has in his possession or under his control anything which would in any such proceedings constitute admissible evidence of that conduct.
(6)For the purposes of this Part a person falling within subsection 1(a) to (c) to shall not be taken to have authorised another person to act on his behalf unless—
(a)that other person is for the time being designated for the purposes of this Part by the Commission as a person through whom complaints may be made, or he is of a description of persons so designated; or
(b)the other person has been given, and is able to produce, the written consent to his so acting of the person on whose behalf he acts.
(7)For the purposes of this Part, a person is serving with the police if—
(a)he is a member of a police force;
(b)he is an employee of a police authority who is under the direction and control of a chief officer; or
(c)he is a special constable who is under the direction and control of a chief officer.