The applicant did not himself bring the cannabis into Australia; it was brought in by the airline. However it is well settled at common law that a person who commits a crime by the use of an innocent agent is himself liable as a principal offender. That is so not only where the agent lacks criminal responsibility, as, for example, when he is insane or too young to know what he is doing, but also where the agent, although of sound mind and full understanding, is ignorant of the true facts and believes that what he is doing is lawful. Thus if A sends out B with a forged bank note for the purpose of passing it, and B does so, being ignorant that it was forged, A is guilty of uttering and publishing the note as true, since "where an innocent person is employed for a criminal purpose, the employer must be answerable": R. v. Palmer and Hudson [1] . If A gives B false particulars to enter in a register, and B enters them in the belief that they are true, A is guilty of making the false entry in the register: Reg. v. Butt [2] . If A, planning a forgery, procures B, an innocent engraver, to make a plate, A is guilty of making and engraving the plate: Reg. v. Bull and Schmidt [3] . So it has been held that where the defendants fabricated false vouchers on the high seas and posted them to a third person who innocently delivered them in Middlesex, a delivery by the defendants took place in Middlesex so that the defendants were triable there, "for the persons who innocently delivered the vouchers were mere instruments in their hands for that purpose; the crime of presenting these vouchers was exclusively their own, as the crime of administering posion through the medium of a person ignorant of its quality would be the crime of the person procuring it to be administered": Reg. v. Brisac and Scott [4] . In the light of this common law principle it has been held that the words "actually commits the offence" in s. 66 (1) of the Crimes Act 1961 N.Z. are apt to describe a person who, with the necessary criminal intent, uses another but innocent person as an instrument to perform the physical act necessary to commit the particular crime: Reg. v. Paterson [5] . The provisions of s. 233B (1) (b) of the Customs Act 1901, as amended, and those of s. 5 of the Crimes Act 1914 Cth, as amended, must also be understood in the light of this well established principle. The applicant could not be held to be guilty on the basis that he aided, abetted, counselled or procured the importation of the cannabis. His conviction can only be sustained on the footing that he himself imported it, through the innocent agency of the airline.