This is one aspect I can't change my mind on - IF it was used by Jeremy, it would be a feared piece of evidence, especially when DNA testing was made available and yet he pushed to have the tests done. So to me, he either KNOWS it wasn't used or he (as Jansus said), isn't guilty.
Your position is flawed though.
If he was innocent and the moderator not used at all then there should have been no blood based DNA found at all on the moderator. Assuming that was the expectation and if that had been found then what good is it? All that proves is no blood remains on it that doesn't prove there wasn't blood previously. Being guilty and using the moderator is a reaosn to want it tested because in that case maybe just maybe there is a chance June and Nevill's blood will be found and you can try saying this means it likely was their blood that had been found by the experts.
A guilty person would still prefer a DNA test to no DNA test because without the DNA test for sure there is no grounds for appeal but with a DNA test hopefully the results can be spun in some manner to provide a ground to appeal on.
Guilty people routinely ask for DNA tests hoping that DNA will have deteriorated to the point where a match cannot be made. They also hope other DNA might have somehow found its way on to be used as a diversion. Since they are already not getting out and can't get more time based on the results they have absolutely nothing at all to lose.
The defense did in fact spin the results but the Court of Appeals didn't fall for it. That spinning involved pretending that SHeila's DNA wasn't found though unquestionably it was, and insisting that June's DNA proves it was her blood not Sheila's that had been in the moderator. But as the court polinted out there is no reason at all to think that the DNA was blood based but rather non-bloodbased and could have resulted from contamination.
The evidence it was not blood based is:
1) in 1986 after the prosecution removed all visible blood the defense found microscopic drops of blood on the first 8 baffles but none beyond that.
2) in 1999 the moderator was tested for the presence of blood but none was detected suggesting the defense had removed the remaining traces of blood that the prosecution missed
3) the test found DNA well beyond the first 8 baffles though blood was never found that far even through testing. So in all likelihood it is not blood based but rather DNA that resulted from contamination.
All these things combined means there is no way at all the DNA could establish the blood of the DNA donors was inside. So the defense had a ready made excuse to dismiss the findings anyway if Sheila's DNA were the only DNA found. But if they could argue her DNA was not found and that someone else's DNA was then they would argue it is blood based and ignore the above.
So Jeremy had nothing at all to lose by having the tests conducted. Long term prisoners arrested before DNA became commonplace who are guilty request DNA tests as often as people who are innocent. While cases where people are relased are published those confirmed guilty rarely are mentioned by the press. One of the rare exceptions ot this rule is this recent example that the press actually published:
http://www.kansascity.com/news/local/article342326/DNA-testing-confirms-guilt-in-1987-sexual-assault-near-the-Plaza.htmlSo much for your notion a guilty person would not request DNA testing...