A person shall not be in possession of or attempt to obtain possession of any of the drugs unless—
(a) he or she is licensed to import or export the drug; or
(b) he or she is licensed or otherwise authorised to manufacture or supply the drug; or
(c) he or she is otherwise licensed by the Governor General or authorised by these Regulations or by any authority granted by the Governor General to be in possession of the drug; or
(d) he or she proves that the drug was supplied for his or her use by a medical practitioner or veterinary surgeon or on and in accordance with such a prescription as aforesaid.
However, this provision shall not apply to any drug supplied to a person for his or her use by a medical practitioner or in accordance with a prescription if that person was at the time of the supply in course of receiving treatment from another medical practitioner in respect of addition to any of the drugs or otherwise, and of being supplied with any of the drugs by or on a prescription given by that last-mentioned practitioner, and did not disclose that fact to the first-mentioned practitioner before the drug was supplied to him or her.