New South Wales Consolidated Regulations(cf Crimes (Detention after Arrest) Regulation 1998 , cl 29)
(1) If a detained person who is a vulnerable person is given a caution, the custody manager or other person giving the caution must take appropriate steps to ensure that the detained person understands the caution.
(2) If the detained person is given a caution in the absence of a support person, the caution must be given again in the presence of a support person, if one attends during the person’s detention.
(3) A reference in this clause to the giving of a caution is a reference to the giving of a caution that the person does not have to say or do anything but that anything the person does say or do may be used in evidence.