Alias sometimes looking at this case with clear thinking can offer something altogether different, it seems as you say bad errors made and still it happens today, there was cross infection of evidence that alone is enogh to throw the case out at the time that silencer should have stayed where it was you move nothing it only became a crime scene when it came into light when I see clear proof Jeremy carried out the shootings I will change my stance to guilty but at present I feel like Henry Fonda did in his role in 12 Angry Men.
What cross contamination calls the case into question?
This isn't Amanda Knox where they used a swab everywhere in the bathroom so that naturally her DNA would be mixed in with the blood they swabbed.
Blood doesn't get inside the mdoerator from innocent contamination. Nor would the family taking a dropper and dripping it inside to intentionally plant it be able to result in the blood found. Not that the family would have anyway to know the fatal shot was a contact wound and would have resulted in drawback anyway or Sheila's blood type.
In the meantime there was other evidence.