This legislation has been repealed.
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 substance that is part of a batch, lot or consignment of the substance of the same kind or description is representative of all of the substance in the batch, lot or consignment; and
(b) each part of a sample of a substance divided for analysis for this Act is of uniform composition with every other part of the sample.