

You believe Ann Eaton deliberately/knowingly contaminated the silencer with diluted period blood from a pair of Sheila's knickers left to soak in a bucket of water

How would she overcome all the points in Adam's post re the relatives fabricating the silencer?
I believe the sort of tests carried out to identify blood groupings requires good quality blood samples of a certain quantity. How does very diluted period blood fit this criteria? The ratio would be about 1:1,000,000.