(1) A transport order made in respect of a person authorises a transport officer or, if subsection (2) applies, a police officer to do these things —
(a) apprehend the person and, for that purpose, exercise the powers under sections 159(2) and 172;
(b) if the person is apprehended — transport the person to the hospital or other place specified in the order as soon as practicable and, in any event, before the transport order expires;
(c) for the purpose of transporting the person, detain the person until the first of these things occurs —
(i) the person is received into the hospital or other place;
(ii) the transport order expires.
(2) A transport order can only authorise a police officer instead of a transport officer to carry out the order if the practitioner or psychiatrist making the order is satisfied —
(a) that there is a significant risk of serious harm to the person being transported or to another person; or
(i) a transport officer will not be available to carry out the order within a reasonable time; and
(ii) any delay in carrying out the order beyond that time is likely to pose a significant risk of harm to the person being transported or to another person.