13  Nominated AAT members
    (1)  The Minister may, by writing, nominate a person who holds one of the following appointments to the Administrative Appeals Tribunal to issue warrants under this Part:
      (a)  Deputy President;
      (b)  senior member (of any level);
      (c)  member (of any level).
  
    (2)  Despite subsection (1), the Minister must not nominate a person who holds an appointment as a part‑time senior member or a member of the Tribunal unless the person:
      (a)  is enrolled as a legal practitioner of the High Court, of another federal court or of the Supreme Court of a State or of the Australian Capital Territory; and
      (b)  has been so enrolled for not less than 5 years.
  
    (3)  A nomination ceases to have effect if:
      (a)  the nominated AAT member ceases to hold an appointment described in subsection (1); or
      (b)  the Minister, by writing, withdraws the nomination.
  
    (4)  A nominated AAT member has, in relation to the performance or exercise of a function or power conferred on a nominated AAT member by this Act, the same protection and immunity as a Justice of the High Court has in relation to proceedings in the High Court.

Source: Section 13 of the law https://www.legislation.gov.au/Details/C2017C00193