COOK (SOC) puts silencer at risk of being Contaminated on 29th August 1985...
DI Cook (SOC) took possession of the bloodstained Bamber rifle, and a silencer which was in the possession of the police by 29th August 1985, and he proceeded to strip the silencer down, removing its baffle plates and exposing them to the possibility of innocent or accidental contamination, by laying the exposed baffle plates out on the very same worktop that the bloodstain Bamber rifle had also be laid during the same tests and examination...
At this time, it was possible that a small flake of dried blood could have detached itself from the bloodstained rifle, and been picked up on the exposed baffle plates as stated...
Once the silencer was rebuilt, any blood that was picked up on the baffle plates, from the bloodstained rifle, would have become trapped inside the silencer, so that when the silencer was submitted top the Lab' on the following day, a small flake of dried blood which was not visibly seen in or on the baffle plates at the time of Cooks experiments the day before, was there when the ballistics expert dismantled the silencer after its submission to the lab' on or after 30th August 1985...
This is one explanation, for how the silencer could have been accidentally or innocently contaminated with blood that did originate or belong to Sheila Caffell, but if so, her blood did not get into the silencer at the time she was shot, but rather at the time of Cooks (SOC) experiments which he performed on the silencer and the bloodstained Bamber rifle on the day before the silencer was sent to the lab' on 30th August 1985...