If:
(a) an instrument is in force under subsection 30EK(1); and
(b) under a law of a State or Territory, a pharmacist is authorised to dispense medicine (the scarce medicine ) covered by paragraph 30EK(1)(a) to a person;
then, despite any law of a State or Territory, the pharmacist may dispense medicine covered by paragraph 30EK(1)(b) to that person in substitution for the scarce medicine, provided that the substitution is in the circumstances specified in the instrument under subsection 30EK(1).