The legislation which deals with Duress is the Criminal Code Act 1913 at Section 32. It provides as follows:
(1) A person is not criminally responsible for an act done, or an omission made, under duress under subsection (2).
(2) A person does an act or makes an omission under duress if —
(a) the person believes —
(i) a threat has been made; and
(ii) the threat will be carried out unless an offence is committed; and
(iii) doing the act or making the omission is necessary to prevent the threat from being carried out;
(b) the act or omission is a reasonable response to the threat in the circumstances as the person believes them to be; and
(c) there are reasonable grounds for those beliefs.
(3) Subsections (1) and (2) do not apply if the threat is made by or on behalf of a person with whom the person under duress is voluntarily associating for the purpose of —
(a) doing an act or making an omission of the kind in fact done or made by the person under duress; or
(b) prosecuting an unlawful purpose in which it is reasonably foreseeable such a threat would be made.