According to the evidence, Shiela's blood ( A, EAP BA, AK1 and HP2-1) was found in silencer DB/1, which was submitted to the Lab' on 30th August, 1985, and handed back to the relatives, who in turn handed it to the police, during JB's trial...
None of this blood could have been found inside the Bamber silencer (DRB/1) because it was not sent to the lab' until after the blood was found, and analyzed, at the Lab'...