In a proceeding for an offence against this Act, it is presumed until the contrary is proved on the balance of probabilities, that—
(a) a regulated substance or regulated therapeutic good that is part of a batch, lot or consignment of the substance of the same kind or description is representative of all the substance or good in the batch, lot or consignment; and
(b) each part of a sample of a regulated substance divided for analysis for this Act is of uniform composition with every other part of the sample; and
(c) a person manufactured, packed or supplied a regulated substance or regulated therapeutic good if the person appears to have done so from any marking or label on an article, container or package containing the substance or therapeutic good for sale; and
(d) a thing that is labelled with the name of—
(i) a regulated substance is the regulated substance; and
(ii) a regulated therapeutic good is the regulated therapeutic good.