The crucial questions that arise are whether the confessions should not have been admitted in evidence because they were obtained by unfair or improper means and, even if they were admissible, what is really in essence the same question, whether they are in all the circumstances sufficient, in the absence of any corroborative evidence, to satisfy a tribunal of fact beyond reasonable doubt of the guilt of the accused. The rule that a court is justified in excluding a confession where it is obtained by unfair or improper means is of comparatively modern growth. It is traced up till 1914 by Lord Sumner in Ibrahim v. The King [3] . His Lordship described this ground as follows: "This ground, in so far as it is a ground at all, is a more modern one. With the growth of a police force of the modern type, the point has frequently arisen, whether, if a policeman questions a prisoner in his custody at all, the prisoner's answers are evidence against him, apart altogether from fear of prejudice or hope of advantage inspired by a person in authority" [4] . Perhaps his Lordship remembered what Lord Brampton had once said: "After arresting, a constable should keep his mouth shut, but his ears open". Since then this ground can be said to have become firmly established. It was accepted by this Court in McDermott v. The King [5] . Dixon J. (as he then was), said: "Here as well as in England the law may now be taken to be, apart from the effect of such special statutory provisions as s. 141 of the Evidence Act 1928 Vict., that a judge at the trial should exclude confessional statements if in all the circumstances he thinks that they have been improperly procured by officers of police, even although he does not consider that the strict rules of law, common law and statutory, require the rejection of the evidence" [1] . The question whether a confession has been obtained by unfair or improper means almost invariably arises from the conduct of the police in questioning a person who may know something about a crime whether they suspect that person to be the author of the crime or not. This has led to the making of rules known as the Judges' Rules which are intended to embody directions with which the police are expected to comply if they do not wish to run the risk of having a confession which has been obtained in breach of these rules rejected. Originally these rules appear to have been four in number. They appear in the footnote to R. v. Voisin [2] . They were as follows: "1. When a police officer is endeavouring to discover the author of a crime there is no objection to his putting questions in respect thereof to any person or persons whether suspected or not from whom he thinks that useful information can be obtained. 2. Whenever a police officer has made up his mind to charge a person with a crime he should first caution such person before asking any questions or any further questions as the case may be. 3. Persons in custody should not be questioned without the usual caution being first administered. 4. If the prisoner wishes to volunteer any statement the usual caution should be administered. It is desirable that the last two words of such caution should be omitted, and that the caution should end with the words "be given in evidence." " In 1918 and 1930 these rules were augmented. In their present form they are printed in Halsbury's Laws of England, 3rd ed., vol. 10, pp. 470-472. The rule with which we are most concerned in the present case is r. 3 which provides that "Persons in custody should not be questioned without the usual caution being first administered". But this rule does not mean of course that after persons in custody have been cautioned they can be questioned or cross-examined on the subject of the crime for which they are in custody. An example of where a conviction was quashed simply because a person who was in custody was asked a question without being cautioned will be found in Thomas Dwyer [3] and an example of where a conviction was quashed because, although the person in custody was cautioned, the questions were improper will be found in Alfred Brown, John Bruce [4] . In the latter case it was said that the police had no right to suggest, by questioning a person detained in custody, that they had evidence of his guilt. The term "in custody" in the Judges' Rules is not a term of art. It is not confined to a person who has been arrested after a charge has been preferred against him. Any person who is taken to a police station under such circumstances that he believes that he must stay there is in the custody of the police. He may go only in response to an invitation from the police that he should do so and the police may have no power to detain him. But if the police act so as to make him think that they can detain him he is in their custody. This was decided in England in Reg. v. Bass [1] and in Scotland in Chalmers v. H.M. Advocate [2] . These cases show that in the present case the appellant was in the custody of the police within the meaning of the third rule, if not from the moment he arrived at the police station at about 10.20 a.m. on the Monday at least from the moment he was left sitting there after the 11 a.m. interview when Carroll left to make further inquiries. The inference is plain enough that the police intended him to believe that he had to remain there and that they would have taken steps to prevent him leaving if he had attempted to do so. He was a man of very limited education and experience and extremely unlikely to know that he need not have gone to the police station when he was invited by two sub-inspectors to do so or need not have remained there if he had not wished to do so unless he had been charged. He was in the control of the police from the moment he entered the police station. He was not told that he could not leave because he made no attempt to do so but it is unbelievable that he would just have sat on there if he had thought he could leave. He was in an inner room with the police in the muster room between him and the street. The police already had evidence that he had been seen at the relevant time in the vicinity of the crimes. There was no necessity whatever to take him to the police station to ask him when he had last seen Leo and Adela alive and where he had spent the night. But it was necessary to take him there to have him in custody. The custody was in all essentials the same as the custody of the accused in Reg. v. Bass [1] . No suggestion was ever made to him, even after Carroll had collected his belongings, that he could if he wished ask to see his father or a solicitor. He was kept quite isolated from the beginning to the end of his interrogations on the Monday. I am certainly not satisfied that the police did not tell the accused that three people had seen him near Georgina's house and that would have been a thoroughly improper statement for the police to make. It is quite clear from their own evidence that the police did tell him that they had information that he had not been to see Yamashita at 2 a.m. on the Sunday morning, which was in effect a statement that they did not believe him, and that also was an improper statement for the police to make. Nor am I satisfied that Carroll did not show him a photograph of Adela's body beside the paw-paw tree or at least leave the photograph where the accused would be likely to see it. The natural inference to draw from the accused's answer to Carroll's question whether Adela's head lay to the right or left is that he had seen the photograph. If his information was derived from dragging her body to the paw-paw tree, presumably by the shoulders, he would have said that it was lying to the left as in fact it was. But looking at the photograph it appeared to be lying to the right. It was contended for the Crown that the initial oral confession that he had found Leo and Adela on the green and had gone mad and killed them and his written confession giving details of the killings contain information which the accused could only have obtained by doing what he confessed to have done, but he could have derived most of this information from the talk of the town and it would have required little prompting from the police to supply the rest. Instead of asking him late on the Monday afternoon after he had been detained for seven hours to point out where Adela and Leo lay it would have been so easy for the police to have pointed out these places and asked him if they were right. It is not necessary to find that the police did any of these things. It is sufficient not to be satisfied that they did not. His Honour said: "Generally, I find, on the evidence, that the police conducted their investigations in this case with propriety". But, with all respect, how could his Honour make this affirmative finding without deciding affirmatively that the police did not inform the accused about the three witnesses, when he was apparently not prepared to go so far as to say that Carroll did not show the photograph of Adela's body to the accused, and when it is clear that the police told the accused that they had information which showed that what he had said about going to Yamashita's house was untrue? In Reg. v. Bass [1] Byrne J., who delivered the judgment of the Court, after pointing out, as this Court has always considered, that the Judges' Rules have not the force of law but are administrative directions for the guidance of the police authorities, said that a statement obtained in contravention of the rules may still be admitted in evidence provided it is voluntary but in the present case it is impossible to my mind for a court to be satisfied in the light of the circumstances that have been mentioned that the confessions of the accused were voluntary in the sense that they were quite spontaneous. On this point his readiness to admit that the scraper was the lethal weapon, when it is not proved that it was, is very illuminating. How could a court be satisfied that the rest of the confessions were true unless it was satisfied that this was the weapon. Even if the confessions were admissible, in the absence of any independent evidence of confirmatory facts which, if the statements in the confession were true, would be practically certain to exist, such as the bloodstains already mentioned, their weight is in my opinion quite insufficient to prove beyond reasonable doubt that the murders were committed by the accused: McKay v. The King [1] . The present case seems to be a typical case for applying the words of Cave J. in Reg. v. Thompson [2] : "I would add that for my part I always suspect these confessions, which are supposed to be the offspring of penitence and remorse, and which nevertheless are repudiated by the prisoner at the trial. It is remarkable that it is of very rare occurrence for evidence of a confession to be given when the proof of the prisoner's guilt is otherwise clear and satisfactory; but, when it is not clear and satisfactory, the prisoner is not unfrequently alleged to have been seized with the desire born of penitence and remorse to supplement it with a confession; a desire which vanishes as soon as he appears in a court of justice. In this particular case there is no reason to suppose that Mr. Crewdson's evidence was not perfectly true and accurate; but, on the broad, plain ground that it was not proved satisfactorily that the confession was free and voluntary, I think it ought not to have been received" [3] .