A standard technique usually adopted when someone sets out to deliberately frame someone, is for that person to introduce a piece of evidence that links the target to having been present at the crime scene, or that the evidence in question can only lead to a particular conclusion - now, let's say, that the silencer was introduced under these circumstances, because with its potential use in the commissioning of these murders, it made it 'nigh on impossible' for Sheila to have shot herself, and then afterward she had unscrewed the silencer in question, and taken it all the way downs to hide it in the aforementioned cupboard, if she was already dead, after having been shot.If this is what somebody did, they went further by making sure that some of Sheila's blood would be found within the silencer, and that paint from the aga surround also be found upon the silencer...
My experience and personal knowledge of how 'red herrings' of this nature are slipped into the case by somebody dishonestly, is that in this instance Jeremy wasn't the one who used the silencer on the gun, went to the trouble of removing it from the barrell of the gun, and hid it away inside a box inside a small cupboard in a room known as the den, as far away as was possible from where Sheila is supposed to have been shot and killed on the bedroom floor. OK let's look at it from another angle, let's say that Jeremy was the killer, and he had gone to all that trouble to fake his sisters suicide, by staging her body with only the rifle on it, having removed the silencer after he had killed her, and taken it all the way downstairs to hide it in a small box in that cupboard, which was known as 'the gun cupboard', without making sure that there wasn't any blood from any of the victims upon it, in particular none of Sheila's blood upon the silencer? Why would he not go the extra mile and clean down that silencer before he put it away? Of course he would have...
If Jeremy had been the killer of his sister, and the silencer had been on the gun when he had shot her, he would have known that the end of the silencer had come into direct contact with his sisters neck. If he had been the killer who almost got away with carrying out the perfect murders (as alleged) and he being careful enough to know that he would have to remove the silencer from the gun when he staged his sisters body, and go to the lengths of going all the way downstairs to hide the silencer away, he would surely have had the basic intelligence to check the silencer to see if any of his sisters blood had got onto it...
I do not think that the silencer was fitted to the barrell of the rifle at any stage during the shootings, but that is another matter...
It certainly wasn't present in the gun cupboard on the morning of the shootings, because cops looked in that cupboard and took 10 photographs of its contents. We know that cops removed 8 photographic negatives from a strip of 10 that were taken of the cupboards contents that morning. Cops don't remove, conceal or destroy evidence that has evidential value which benefits their case, only when it might be beneficial a defendant...
