Gotta love the passenger brief, . ( Link )
Brief each passenger ( or legal Guardian ) as follows:
"(a) the person does not hold a standard medical certificate required for private pilots;
(b) the person holds a CASA-issued certification that the person meets a lower medical standard, and that permits use of the person’s private pilot licence subject to conditions;
© the lower medical standard is based on the medical standards applicable to commercial drivers’ licences;
(d) the person is carrying the person’s medical certificate, and a statement of the applicable conditions, for inspection by a passenger or a guardian of a passenger."