Ombudsman Act 2009

(1) A complaint about administrative action of a public authority or

conduct of a police officer may be made by:

(a) a person aggrieved by the action or conduct; or

(b) a person representing a person aggrieved by the action or conduct; or

(c) a third party or a person representing a third party.

(2) However, a police officer or person representing a police officer may make a complaint about conduct of a police officer only if the conduct:

(a) constitutes an offence punishable by imprisonment; or

(b) is likely to bring the Police Force into disrepute or diminish public confidence in it.

(3) In addition, a third party may make a complaint only if:

(a) the complaint raises a substantive issue; or

(b) the party has first-hand evidence about the subject matter of the complaint.

Example for subsection (3)(b)

An independent bystander who witnesses a police officer's conduct.