"(a) information that tends to exculpate the accused, (b) information that would be likely to be of material assistance to the proper preparation or presentation of the accused's defence, (c) information that relates to a material line of the accused's defence and which is likely to form part of the prosecution case."
"The prosecutor must - (a) disclose to the accused any prosecution material which has not previously been disclosed to the accused and which might reasonably be considered capable of undermining the case for the prosecution or of assisting the case for the accused."
"In my opinion, provided the witnesses' previous convictions are relevant to a legitimate attack on character or to their credibility, the material sought would plainly be relevant to his defence. It is therefore material which the petitioner is prima facie entitled to have disclosed to him."
"What use, if any, the agent or counsel chooses to make of the information is a matter for him and he may well not be able to decide until he has it. But, at the very least, the information will help in assessing the strengths and weaknesses of the witness. Therefore, information about the previous convictions of any witness to be led at the trial 'would be likely to be of material assistance to the proper preparation or presentation of the accused's defence.' "
"The Solicitor General said that Lord Macfadyen's opinion in Maan v HM Advocate suggested that only those convictions and outstanding charges that were material should be disclosed. He was not willing to commit himself to an obligation to disclose them all, whether or not they were material, as he had not had an opportunity to examine the article 8 implications for the person concerned if embarrassing or damaging information was revealed which had no bearing on his credibility or reliability. I too would prefer to leave this issue over until it requires to be decided in another case."
"While the general description of the duty is now settled, questions can still arise about what that duty involves and how it applies in various circumstances. The decisions of the Board in Holland v HM Advocate and Sinclair v HM Advocate answered two such questions. Included within the general description of disclosable material are two classes of material: the police statements (as opposed to precognitions) of any witness on the Crown list and - subject to the Crown's argument on article 8 which it is unnecessary to determine in these proceedings - the previous convictions and outstanding charges relating to those witnesses."
"I do however consider that a wish that certain facts in one's past, however, notorious at the time, should remain in that past is an aspect of the subject's private life sufficient at least to raise questions underarticle 8 of the Convention ."
"Moreover, public information can fall within the scope of private life where it is systematically collected and stored in files held by the authorities. That is all the truer where such information concerns a person's distant past."
"Indeed, this embraces even those parts of the information that were public since the information had been systematically collected and stored in files held by the authorities."
"Nevertheless, the authorities, although expressed in what may be thought to be somewhat old fashioned terms, support the proposition that a history of violence may affect the witness's credibility on the basis of general depravity. That must be a matter of degree."
"Compliance with the duty requires the Crown, without having to be requested to do so , to disclose all material previous convictions and outstanding charges for all witnesses on the Crown lists, including section 67 notices."
"Put shortly, the Crown must disclose any statement or other material of which they are aware and which either materially weakens the Crown case or materially strengthens the defence case ('disclosable material)."
"Where the Crown obtains a defence witness's record, it must be disclosed to the defence in the same way as that of a Crown witness."
"7. Thus we have a clear and simple case in which the convictions of the prosecution witness were not disclosed when they should have been as a result of inadvertence or oversight. What is the effect of such non-disclosure if a defendant is convicted and evidence of convictions on the part of the prosecution witness then comes to light? There is no simple and straightforward answer to that question. The answer will depend on the weight of evidence in the case, apart from the evidence of the witness whose convictions have not been disclosed. The greater the weight of the other evidence the less significance, other things being equal, the non-disclosure is likely to have had. The answer will also depend on the extent to which the credibility and honesty of the prosecution witness whose convictions have not been disclosed is at the heart of the case. If, as here, the prosecution witness whose convictions have not been disclosed is the only witness against a defendant, and his credibility and honesty are squarely in issue, and the jury are led to believe that that witness is of good character when such is not the case, then there is strong ground for contending that the conviction is unsafe...."