54 The existence of intention is a question of fact and in most cases the outcome will depend on inferences to be drawn from proven facts. When it is necessary to show that a person had an intention to have in his possession a narcotic drug, intent is established if the person knew that an article in his possession comprised or contained a narcotic drug: Saad (supra) at 244. For the purposes of this analysis, I assume it is not necessary to prove an intention to possess a particular type of drug. Accordingly, if an accused knows that a package contains drugs but does not know what type of drug (or how much) or does not know all the types of drug in the package, he has an intention to possess the whole sufficient to prove separate charges for each type of drug contained in the package. But that is not the situation on the applicant's version of the facts in this case. He goes beyond simply asserting he did not know that ecstasy was in the satchel sent to him from India. On the applicant's version, his expectation was, and to his knowledge, the package would contain only cannabis. The distinction is between lack of knowledge of the type of drug in the package as against positive knowledge and an intention to have (only) cannabis in his possession. That knowledge is sufficient to justify an inference of intention to import a narcotic good which was in fact cannabis. However, that intention applies to the whole of the narcotic goods in the package. It does not support, and in fact negatives, an intention to possess a subset of the narcotic goods in the satchel which comprises narcotic goods of a type different from that which he expected or intended. Even if this analysis is incorrect, his version of events would, if accepted, constitute a reasonable excuse, proof of which lies on him under s 233B(1)(c) of the Act: see He Kaw Teh (supra) at 575 - 576 per Brennan J.