(1) For the purposes
of this Act and in particular the definition of public officer in section 3,
another Act or the regulations made under this Act may —
(a)
prescribe an office to which people are appointed under a written law for a
public purpose and a function of which is the investigation of offences; and
(b) in
respect of that office, specify those of the powers in this Act that a holder
of that office may exercise, being powers that this Act provides may be
exercised by a public officer.
(2) A public officer
may only exercise a power under this Act in relation to an offence if —
(a) the
office held by the public officer has been prescribed under subsection (1)(a);
and
(b) the
power is one that has been specified under subsection (1)(b) as one that the
officer may exercise; and
(c) the
offence is one that the officer, by virtue of being such an officer, is
authorised to investigate or prosecute.