I totally disagree, you cannot get a 13 marker match from contamination since Sheila's DNA had very little in common with anyone who ever handled the silencer. Under UK law a 13 marker match has no significance but in the real world it means the chances of it not matching Sheila are millions to one. Given that the blood found in the silencer in 1985 was the same group as Sheila I find the 'just a coincidence theory' to be a theory too far.
Good morning John
Even if the DNA was a 20/20 match it could still be there as a result of contamination. Eg I invite you round for a cuppa. You leave skin cells, sweat/fingerprints and saliva on mug. You leave. I put the mug you drank out of in the dishwasher. As a result I end up with your skin cells and sweat/fingerprints on my hand. My neighbour then calls to invite me round for a cuppa. I accept and as I handle the neighbour's mug I transfer your DNA on my hand to the neighbour's mug. Your DNA is now on a mug you have never touched or been anywhere near.
As the CoA doc states, as DNA testing was not even envisaged in 85/86 no precautions were taken to protect exhibits from contamination eg jurors handling SC's and June's bloody nighties alongside the silencer/emptying baffles. Therefore it is highly likely jurors contaminated the silencer/baffles with June and SC's DNA whether that be skin cells, blood etc.
As you probably know different techniques are available to identify DNA. One being LCN DNA. This technique was chosen as it is capable of producing a result from just a few skin cells and as the blood from the original sample 85/86 had all but been swabbed away it offered a possibility. The downside is the risk of contamination as outlined above. Also LCN DNA is incapable of identifying the source eg blood, sweat, skin cells etc.
Had the CCRC have been switched on they would not have referred the case to CoA.
It really is "utterly meaningless" as per the scientists and 3 appeal court judges. If you personally choose to believe otherwise that's obviously your prerogative. I like a man with an independent mind. *
This link explains the incredibly small amounts of biological matter required for a LCN DNA result. As you will see we are talking amounts so small they are not even visible to the naked eye. Talking of naked must jump in the shower. *
http://en.m.wikipedia.org/wiki/Low_copy_number* Would like to have

but it appears that your good self and Myster do not appreciate my coquettishness