(1) The Commissioner may, from time to time, determine the duties or classes of duties in the Police Force of a member of or above the rank of Commander that:
(a) may be performed on an appointment for a fixed period; or
(b) may only be performed on an appointment for a fixed period.
(2) Duties referred to in subsection (1) may, subject to the relevant determination under that subsection, be performed either by the appointment under section 16 of a person on contract or by the promotion or transfer of a member for a fixed term.
(3) In making a determination under subsection (1), the Commissioner shall specify a period, not exceeding 5 years, as the period for which a person may be employed to perform the duties.
(4) The Commissioner may determine the terms and conditions to apply to and in relation to employment to perform duties referred to in subsection (1), and where such a term or condition is inconsistent with this Act, the term or condition so determined prevails and the conditions of or under this Act, to the extent of the inconsistency, have no effect.
(5) The period of employment to perform duties referred to in subsection (1) may be renewed from time to time by the Commissioner for a period not exceeding the duration of the original period.
(6) Where duties referred to in subsection (1) are performed by a member promoted or transferred as referred to in subsection (2), the terms and conditions to which the member is subject as a permanent member at his rank shall be deemed to be varied, to the extent of the determination under subsection (4), for the duration of the period during which the member performs those duties.