[8] In the case of a person charged in such a case with possession as principal offender, here Ms Briggs, it would certainly be enough for the Crown to stop short at proving, directly or by inference, knowledge in that person that the parcel to be collected contained something: as put by Fitzgerald P in Clare [1993] QCA 558; [1994] 2 Qd R 619, 639, "a thing or substance", or per Davies JA (p 645) an "object". It would not have been necessary for the Crown to establish that she knew the nature of that object, thing or substance. See also Myles [1997] 1 Qd R 199, 210 per Pincus JA: "the knowledge which is relevant for the purpose of s 57(c) [now s 129(1)(d)] is knowledge of the presence of a substance which is in fact a drug, not knowledge of the nature of the substance." What His Honour there said should not in my view be read as entailing a need to establish knowledge of the presence of a substance as such: what needs to be established is conscious possession of something, whatever its constitution or identity. Clare has been consistently reaffirmed and applied: see, for example, R v Nguyen and Truong [1994] QCA 389; [1995] 2 Qd R 285, 288; Crosthwaite v Loader (1995) 77 A Crim R 348, 356; Jenvey v Cook [1997] QCA 207; , 395. I refer briefly to the reasoning in in para 15 below.