(1) A rail safety worker who is still on railway premises after carrying out rail safety work is not obliged to comply with a requirement made under section 127(1) of the Rail Safety National Law (NT) to submit to a drug screening test or oral fluid analysis (or both) if:
(a) the worker is not involved in a prescribed notifiable occurrence; and
(b) more than 30 minutes have passed since the worker carried out the work.
(2) A rail safety worker who is involved in a prescribed notifiable occurrence is not obliged to comply with a requirement made under section 127(1) of the Rail Safety National Law (NT) to submit to a drug screening test or oral fluid analysis (or both) if:
(a) more than 4 hours have passed since the worker was involved in the occurrence; or
(b) the worker:
(i) has completed rail safety work for the work shift and departed from his or her work location for the work shift; and
(ii) was unaware of the occurrence when the worker completed work for the work shift.