Theories on the blood in the silencer

[BarefootDanC]

I think these are all of the theories about the blood in the silencer - which of these are plausible?

1) The blood was Sheila's and got in there from the killings - Jeremy is guilty
1b) The blood was Sheila's and got in there by her shooting herself with her toes )
2) The blood was an intimate mixture of the parents (got in there from the killings).
3) The blood was rabbit's blood.
4) The blood was Sheila's menstrual blood, planted
5) The blood was Sheila's blood, planted by the relatives which they obtained from blood in the house
6) The blood was Robert Boutflour's blood, plainted by him (or possible got in there by mistake).
7) The blood was David Boutflour's
The blood was planted by the police

[BarefootDanC]

Plus (9) CambridgeCutie's theory: that there was never any blood and the results are fictitious

[Rob_]

The lab results are dubious to say the least, one group was missing and two groups only had one result not the two required to give a reliable grouping.

[Cambridgecutie]

Plus (9) CambridgeCutie's theory: that there was never any blood and the results are fictitious

There is actually a lot underpinning this theory. 

[David1819]

I think these are all of the theories about the blood in the silencer - which of these are plausible?

1) The blood was Sheila's and got in there from the killings - Jeremy is guilty
1b) The blood was Sheila's and got in there by her shooting herself with her toes )
2) The blood was an intimate mixture of the parents (got in there from the killings).
3) The blood was rabbit's blood.
4) The blood was Sheila's menstrual blood, planted
5) The blood was Sheila's blood, planted by the relatives which they obtained from blood in the house
6) The blood was Robert Boutflour's blood, plainted by him (or possible got in there by mistake).
7) The blood was David Boutflour's
The blood was planted by the police

Only 4,5 and 6 have means, motive and opportunity.

[Cambridgecutie]

Only 4,5 and 6 have means, motive and opportunity.

Confirmation bias.

[BarefootDanC]

Only 4,5 and 6 have means, motive and opportunity.

For no 6, how would that work? How would Robert Boutflour have possibly known that his blood matched Sheila's? Not just blood groupings (AB or 0) but the other blood results?

[David1819]

For no 6, how would that work? How would Robert Boutflour have possibly known that his blood matched Sheila's? Not just blood groupings (AB or 0) but the other blood results?

He would not need to know. If it is RWBs blood, its far more likely he simply though human blood alone would suffice in incriminating JB.

[Cambridgecutie]

He would not need to know. If it is RWBs blood, its far more likely he simply though human blood alone would suffice in incriminating JB.

No.  The use of blood groupings was well established in criminal trials pre WHF.  The general public would be familiar with hearing about such on the news. 

[BarefootDanC]

He would not need to know. If it is RWBs blood, its far more likely he simply though human blood alone would suffice in incriminating JB.

He must have thought that the blood would be tested - and just imagine if the blood matched none of the victims and was only a match for him! I think most people who don't know anything about blood grouping (DNA testing wasn't a thing them) would assume that forensic scientist would be able to trace blood back to the person who it came from.

[Cambridgecutie]

He must have thought that the blood would be tested - and just imagine if the blood matched none of the victims and was only a match for him! I think most people who don't know anything about blood grouping (DNA testing wasn't a thing them) would assume that forensic scientist would be able to trace blood back to the person who it came from.

https://www.historybytheyard.co.uk/dna.htm#:~:text=In%201925%20it%20was%20discovered,blood%20to%20the%20point%20where

[Cambridgecutie]

https://www.historybytheyard.co.uk/dna.htm#:~:text=In%201925%20it%20was%20discovered,blood%20to%20the%20point%20where

The relatives would be aware of the above through high profile criminal cases.

[Curiosity]

The relatives would be aware of the above through high profile criminal cases.

In '85 when there was no internet at WHF, their other farms or Bourtree to inform them of such?

[BarefootDanC]

The relatives would be aware of the above through high profile criminal cases.

Only if they took an interest in such things, and they weren't educated in science.

In any case, They still wouldn't have known that RB's blood was a match for SC

[Cambridgecutie]

In '85 when there was no internet at WHF, their other farms or Bourtree to inform them of such?

I haven't explained very well.  I've had a long hard day filling 4 green bins with leaves 

David seems to be saying RWB planted his blood believing forensics were unable to distinguish blood groups and the fact it matched SC's was pure coincidence. 

I am saying newspapers would have been full of criminal cases where blood groupings were routinely used long before WHF.  Therefore the chances are the relatives had some awareness of blood groupings.  ABO groupings were part of the O level biology syllabus. 

The idea the relatives were involved in fabricating the silencer evidence is completely out of the question.