(1) An authorisation to exercise any of the public health risk powers for the purposes of section 189 may be given orally or in writing.
(2) If the authorisation is given orally, it must be confirmed in writing as soon as reasonably practicable.
(3) An authorisation must—
(a) state that the authorisation is given under this Division;
(b) generally describe the risk to public health to which it relates;
(c) if the risk to public health has occurred, name or describe the place at which the risk to public health has occurred;
(d) specify the time at which the authorisation is given;
(e) specify any restrictions or limitations subject to which the public health risk powers may be exercised under the authorisation;
(f) specify the period of time for which the authorisation continues in force.
(4) The Chief Health Officer may extend the period of time for which an authorisation continues in force before the authorisation expires.