There is no way to prove it wasn't used. In the meantime the evidence that proves it was used no longer exists for DNA testing. DNA testing of the blood determined by the defense and prosecution experts to be group A would not be able to prove the suppressor wasn't used but would be able to prove if that blood wasn't Sheila's which would mean no one could prove whether it was used or not. Such doubts are resolved in the favor of defendants.
But the defense didn't keep the evidence nor did the prosecution so neither is avaialbel to see if DNA testing could have been done. Most of the time such tests destroy DNA anyway but if either saved the tests they could have seen for sure whether DNA testing could be done or not.
Basically, you are talking bullshit..
To coin a legal phrase, "Fuck off" with your negative attitude, there was never any evidence to prove that Jeremy killed anyone, I will provide the detail to prove beyond doubt that the Bamber owned sound moderator was not fitted to the gun barrel of the anshuzt rifle, when Sheila was shot and killed...
How the fuck can anyone try to negate evidence, without first of all hearing or learning what the proposed testing is?
I am all for free speech, but hey let me spell out what sort of fucking test I am proposing before you put your spin on it - you are one fucking rude dude.What sort of an advocate are you supposed to be, at least have the fucking decency to hear what I have got to say. You appear to be a fucking piece of shit, typical of someone who is corrupt and who enjoys working in a fucking corrupted, system...
"Bollocks", at least give me the opportunity to have my say, before you respond, your arguments thus far in all other matters are simply not factual, you have nothing to back up or support anything you have been saying, thus far...