623Supplying offence—presumption if trafficable quantity

623 Supplying offence—presumption if trafficable quantity supplied etc (1) If, in a prosecution for an offence against section 622 (Supplying controlled drug to child for selling), it is proved that the defendant— (a) supplied a trafficable quantity of a controlled drug to a child; or (b) possessed a trafficable quantity of a controlled drug with the intention of supplying any of it to a child; it is presumed, unless the contrary is proved, that the defendant had the belief about the sale of the drug by the child required for the (2) This section does not apply to a single charge under section 629 (Single offence for trafficking etc on different occasions) if the conduct on each occasion to which the charge relates did not involve a trafficable quantity of the controlled drug.