"In the exercise of the powers conferred upon him by this section the director of Public Prosecutions shall not be subject to the direction or control of any other authority."
"PB [the interviewer]: In relation to his hand, you know if it was swabbed and if so … DPP: My recollection is that the swabbing of his hands revealed … ahm … residue from gunpowder. PB: Yes, now we spoke with Dr Carolyn Gomes earlier and she suggested that the … according to the forensic expert, such residue as there may have been was inconsistent with Mr Genius firing or discharging a firearm. DPP: I can't recall seeing any such statement by the forensic expert, but I will look at that again."
"11. That the Director of Public Prosecutions having been made aware of the inquisition and depositions at the inquest touching the death of Patrick Genius sought to exercise his powers to determine, notwithstanding the findings of the jury, whether there was anyone who he could pursue charges against in relation to the said death, after a proper examination of the inquisition, depositions, statements and other documents at his disposal. 12. That on a careful examination of all the material available to him including medical and forensic evidence, the Director of Public Prosecution came to the decision that there was not sufficient evidence in law to charge anyone. 14. That in the exercise of his powers, the Director of Public Prosecutions would be guided by several factors, not limited to but including matters expressed by Lord Bingham of Cornhill in R v Director of Public Prosecutions ex parte Manning[2000] 3 WLR 463 , 474 where he said: ' … In most cases the decision will turn not on any analysis of the relevant legal principles but on the exercise of an informed judgment of how a case against a particular defendant, if brought, would be likely to fare in the context of a criminal trial before (in a serious case as this) a jury. This exercise of judgment involves an assessment of the strength, by the end of the trial, of the evidence against the defendant and of the likely defences. It will often be impossible to stigmatise a judgment on such matters as wrong even if one disagrees with it. So the courts will not easily find that a decision not to prosecute is bad in law … '"
"The DPP illustrated that which should have been obvious to the applicant upon the receipt of the available evidence. That to have engaged in a prosecution on the basis of that material would have been an exercise in futility."
"It is not necessary for present purposes to explore exhaustively the circumstances in which the occasions for judicial review of a prosecutorial decision may arise. It is sufficient, in our opinion, in cases involving the exercise of prosecutorial discretion to apply established principles of judicial review. These would have proper regard to the great width of the DPP's discretion and the polycentric character of official decision-making in such matters including policy and public interest considerations which are not susceptible of judicial review because it is within neither the constitutional function nor the practical competence of the courts to assess their merits. This approach subsumes concerns about separation of powers."
"23 Authority makes clear that a decision by the director not to prosecute is susceptible to judicial review: see, for example , R v Director of Public Prosecutions, ex p C[1995] 1 Cr App R 136 . But, as the decided cases also make clear, the power of review is one to be sparingly exercised. The reasons for this are clear. The primary decision to prosecute or not to prosecute is entrusted by Parliament to the Director as head of an independent, professional prosecuting service, answerable to the Attorney General in his role as guardian of the public interest, and to no one else. It makes no difference that in practice the decision will ordinarily be taken by a senior member of the Crown Prosecution Service, as it was here, and not by the Director personally. In any borderline case the decision may be one of acute difficulty, since while a defendant whom a jury would be likely to convict should properly be brought to justice and tried, a defendant whom a jury would be likely to acquit should not be subjected to the trauma inherent in a criminal trial. If, in a case such as the present, the Director's provisional decision is not to prosecute, that decision will be subject to review by senior Treasury counsel who will exercise an independent professional judgment. The Director and his officials (and senior Treasury counsel when consulted) will bring to their task of deciding whether to prosecute an experience and expertise which most courts called upon to review their decisions could not match. In most cases the decision will turn not on an analysis of the relevant legal principles but on the exercise of an informed judgment of how a case against a particular defendant, if brought, would be likely to fare in the context of a criminal trial before (in a serious case such as this) a jury. This exercise of judgment involves an assessment of the strength, by the end of the trial, of the evidence against the defendant and of the likely defences. It will often be impossible to stigmatise a judgment on such matters as wrong even if one disagrees with it. So the courts will not easily find that a decision not to prosecute is bad in law, on which basis alone the court is entitled to interfere. At the same time, the standard of review should not be set too high, since judicial review is the only means by which the citizen can seek redress against a decision not to prosecute and if the test were too exacting an effective remedy would be denied."