“5. The statistical evaluation provided addresses only whether an individual could be a possible donor of DNA and does not address the mechanism by which any DNA was deposited, the time at which it may have been deposited, or the order in which different contributions of DNA were deposited.…. 6. If it were to be accepted that the DNA from William Jones is present on the safety pin, then the DNA result alone does not assist in determining: (a) whether William Jones was the last person to touch the safety pin before it was recovered; (b) how long ago the DNA from William Jones was deposited on the safety pin; (c) the mechanism by which the DNA from William Jones was deposited on the safety pin, including whether it was left directly (primary transfer) or indirectly via an intermediary (secondary transfer) …. 7. There are a range of factors which affect the likelihood of the transfer of DNA via either direct or indirect mechanisms which have been discussed in both of our previous statements. 8. If William Jones has handled the safety pin at some time, without wearing gloves, then he may have transferred his DNA directly to the safety pin. Therefore, in our opinion the result obtained is with[in] the range of expectations we might have if William Jones has had direct contact with the safety pin at some stage. 9. If sufficient DNA from William Jones was present on another person or item then it may have been transferred to the safety pin indirectly. 10. Both direct and indirect (also called secondary) transfers of DNA are possible and have been demonstrated in experiments. There is little experimental data to support any expert opinion on the weight to be assigned to the route of transfer in a particular case. However, there are a range of factors which affect whether or not DNA may be transferred by indirect means, and consideration should be given to these factors when discussing indirect transfer. 11. Logically, any transfer method requiring one step will be likely to occur more often than a path requiring two steps. But it does not follow from this that the path requiring one step must have occurred in the specific instance. 12. Since the tiny traces of DNA or skin involved in such transfer are invisible to the naked eye, it is not realistic to expect anyone to be able to account for the ways in which their DNA may have been transferred by indirect methods. 13. In the absence of experimental data relevant to this case, there is no scientific basis for assigning a weight of evidence to possible direct or indirect (secondary) transfer.”
“I am entirely satisfied that it is properly open to a jury to conclude that there was an agreement of the kind alleged by the prosecution. In particular, a jury would properly be entitled to find: (a) that there was indeed a series of tit-for-tat exchanges between the parties indicated (b) that the depositing of the hand grenade was an event in that series (c) that whoever deposited the grenade did not simply act of his/her own motion but pursuant to an agreement with one or more other persons (d) that the grenade contained an explosive substance.”
“there was no evidential or legal principle that a case can never be left to a jury solely on the basis of the presence of the defendant’s DNA profile on an article left at the scene of a crime, but whether it will be appropriate to do so will depend on the particular facts of the case.”
“The prosecution do not appear to be suggesting that it was necessarily William Jones himself who placed the grenade outside 27 Cleveland Rd, but in a general sense, as noted, this is a Warrington case and William Jones is from the area. It is not, for example, as though he is from some distant corner of the country with no connection to anyone else in the case.”
“In my judgment the DNA evidence in this case, when viewed in context, is sufficient to constitute a case to answer. It would be open to a jury to conclude (a) that any grenade – be it a military combat grenade or a “harmless” paintball grenade – is a relatively unusual item, with which only a minority of the population is likely to come into contact (b) that William Jones’s DNA was on the firing pin of the grenade recovered by the police (c) that it can only have got there because either William Jones himself or some other person or thing bearing his DNA has had contact with that part of the grenade (d) that William Jones is linked to one or more persons who were parties to the conspiracy. In these circumstances, and in the absence of any evidence of a contrary explanation, it would in my judgment be open to a jury to conclude that the only explanation for the presence of William Jones’s DNA on the grenade is that he was himself a party to the conspiracy alleged. Having reached the above conclusion, it is not necessary for me to consider the cogency of the attribution evidence relied on by the prosecution in relation to the disputed 2893 phone.”
“22. On the facts of this case it is quite clear that there was a case for the appellant to answer. His was the major DNA profile on the door handle of the car which was used by the offender in the course of the robbery. The expert evidence was that the likely reason for the defendant’s DNA profile being on the door handle was that he had touched it at the close of the prosecution case there was no explanation for this fact. The rhetorical question posed by the judge demonstrated some geographical connection between the location of the offence and the appellant albeit not sufficient to amount to supporting evidence….”