'Sheila’s menstrual blood (which was watered down inside a bucket) was planted deep inside the silencer, in EXACTLY the same pattern that back spatter makes is impossible. Menstrual blood is not like normal blood. It doesn’t coagulate, for one thing. It also contains tissue and mucous from the uterus, has different cells, and has fewer platelets, less haemoglobin and is completely different. The forensic team would have immediately seen just by looking at it that it was menstrual blood.'