Do you think SJ fabricating the silencer should have been a ground in 89, 2002, 2012 or 2021?
To secure an acquittal at trial it was necessary to demonstrate that the blood supposedly found inside the silencer did not get there by way of the drawback phenomenon. As the defence effectively went along with the prosecution narrative claiming SC used the silencer and the blood represented an intimate mix of NB and June's blood it resulted in a guilty verdict.
1989 - the defence had a little go at undermining the blood by arguing heat from firing of the rifle may have altered the blood results but still with the mixed blood theory.
2002 - the defence attempted to undermine the blood using LCN DNA evidence but still with the mixed blood theory
2012 - the defence attempted to undermine the silencer by arguing it was not on the gun evidenced by the PS' photographic evidence and testimony from the US re the marks to NB's back
2021 - the defence are attempting to undermine the silencer by saying there was more than 1!? No idea how this undermines the evidence presented at trial.
All of the above utterly useless. You have to strike at the heart which is deliberate contamination because that is exactly what happened. It is not necessary to point the finger at the perp(s) just need to demonstrate that it was scientifically impossible for it to have happened the way the prosection claimed ie drawback phenomenon and that the evidence was fabricated.