ngb, Anthony Arlidge questioned the scientist and showed him a list of names, which didn't include the relatives' names and results. The scientist concurred with Arlidge that nobody else on the list shared blood groupings with Sheila Caffell; the inference being that the blood in the SM could only have come from Sheila Caffell. Therefore the jury were led to believe that the blood groupings in the SM did not match anyone else's blood groupings.
I assume the jury were aware that the relatives discovered the SM after being given the keys to the farmhouse by Jeremy Bamber, subsequent to police searches.
If Rivlin had cross examination the scientist regarding the blood groupings of Robert Boutflour as (per detailed by the scientist in his written communication) do you think this may have unsettled the jury regarding the SM evidence? Could it have also restrained Justice Drake in his summing up?
Ah! I see it all now. Well, some of it. As there's no concrete proof that JB is innocent, supporters are suggesting that if the jury could have been unsettled enough, they'd have found him innocent. Doesn't mean he was, though, does it? Aha! I hear you counter, but there was no concrete proof that he was guilty! There didn't need to be. All that was necessary to prove was time, opportunity, and motive, which were all present. Added to which, as the judge said, it was either him or Sheila.