[9] From saying that evidence is challenged but not contradicted, it is a long step to saying that, in doing so, the trial judge impermissibly commented on the accused's failure to give evidence, and did so in such a way as to suggest that he had failed to testify because he was guilty of the offences charged. Whether or not evidence is contradicted by conflicting testimony from the accused or any other source is ordinarily a question of fact for the jury to assess and determine; but as such it is also a matter on which by s 620(1) of the Criminal Code a trial judge is entitled, if he or she thinks fit, to make "an observation on the evidence". What is more, a jury in Queensland is always made aware of the accused's failure to give evidence by the requirement, fulfilled in this case as in all others, under s 618 of the Code that the accused be asked in open court whether he intends to adduce evidence in his defence. His election or answer to that question is made in full view and hearing of the jury, so that if, upon the Crown closing its case, he chooses not to testify they are left in no doubt that the evidence adduced by the prosecution is not contradicted by any evidence given by him in court. In these circumstances it would be absurd to suggest that a judge is improperly commenting by referring to evidence as uncontradicted when the statute law of Queensland requires that the absence of such evidence be brought so demonstrably to their attention. The judge in a case like this was doing no more than referring to a fact that was, to the knowledge of the jury, both indisputable and undisputed.