"(1) Any person who without lawful authority or reasonable excuse, the proof whereof shall lie on him, has with him in any public place any offensive weapon shall be guilty of an offence . . . (4) In this section ..."offensive weapon" means any article made or adapted for use for causing injury to the person, or intended by the person having it with him for such use by him or by some other person."
" . . . it could not be a reasonable excuse to say that he had [an offensive weapon] with him for his work. Even if it could be said that it was capable of being a reasonable excuse to have it with him for work, that, of itself, would provide no reasonable excuse for having it with him in the early hours of the morning."
"The fact that the respondent did not know it was an offensive weapon is not relevant to the issue of reasonable excuse."
"Whether the excuse advanced by the respondent of having the butterfly knife with him in a public place was a reasonable excuse", the answer is that the Magistrates were entitled to come to the conclusion that the excuse advanced by the respondent in this case was capable of being a reasonable excuse. In answer to the second question: "
"The defence of reasonable excuse only arose once it was accepted and proved that a defendant was in possession of an offensive weapon but, as a matter of principle, it could not be possible for a defendant to argue once found to have wielded an offensive weapon, that he did not know it was an offensive weapon. It was not permissible for lack of knowledge to be coupled with an explanation for the use of the weapon so a combination could provide a reasonable excuse, and accordingly the situations where the defence of reasonable excuse was available were restricted."
"As a matter of principle it cannot be possible for a defendant to argue, once found to have with him an offensive weapon, that he did not know it was an offensive weapon. The Act is an Act aimed at eradicating the carrying of dangerous weapons in public. The whole purpose of the Act is to provide strict liability in respect of objects regarded as dangerous. To allow lack of knowledge to be raised as a reasonable excuse defence would defeat the purpose of imposing strict liability in respect of the possession of such a weapon. This is so where the object is an offensive weapon per se."
"Given the purpose of the legislation, in our judgment, it could not be a reasonable excuse to say that he had it with him for his work."
"In our judgment, in the particular circumstances of this case, the matters raised in the defence statement, read in the context of the appellant's answers in interview, should have been left to the jury. It would have been a matter for the jury to say whether the defendant had a reasonable excuse for having the knife in his back pocket. This is not a case in which the defence was merely that the appellant had forgotten that he had the knife. His defence was that he had bought the knife as an ornament, that he had kept it at home and that he was simply transferring it, together with his other belongings, from one home to another without any intention of using the knife. In addition, it was his case that he had forgotten about the knife during the two weeks or so that his belongings were in the car. Assuming that those facts were put before the jury, as they would have been but for the ruling that the judge indicated that he would give, it would have been for the jury to decide where the truth lay and to say whether, in all the circumstances, the appellant had a reasonable excuse for having the knife with him or not. As we see it, save in the case where the appellant's sole excuse for having the offensive weapon with him is that he forgot, which was the position in McCalla, it will almost invariably be a matter for the jury whether he had reasonable excuse or not."