Fixit sent me this for comment
(Para 86). Ms McDonald deals with the 2 hairs said to be have found on the Blade. This was for her, and the Justice Minister of the time, evidence that held together the Crown case weakened in many ways since the trial, before a positive position for the Ketch could be submitted. Unfortunately, Ms McDonald completely omitted from her first report and supplementary that ESR changes post the Watson trial include samples and exhibits not to housed together let alone examined contemporaneously. In addition:
The hairs were not found on The Blade at all.
The hairs were not sighted by any witness who examined The Blade for forensic evidence, noting that ‘blond hairs,’ blood, semen samples, would have been a priority for searchers.
The hairs were also not confirmed as found on a blanket taken from the Blade as Ms McDonald and the Minister state.
In first searches of the hairs bagged, having said to have come from the blanket the longest were 3inches (75mm). 11 were chosen including both brown and yellow blond hairs for DNA testing, none of which returned a positive result from the DNA test.
In modern times the hairs from the blanket would have been counted and the number recorded. Unfortunately, that did not happen in the Watson case. However, the length of the longest hairs was recorded, allowing a specific reference point which follows.
The ‘2 hairs’ were found after the plastic bag was emptied onto a table in which ‘samples’ from a hair brush just delivered by police from the home of Amelia Hope were examined.
The first of the 2 hairs found was 6inches (150mm), the second hair was 8 inches (200mm.)
The length of any hairs not being found before the sample bag was brought to the laboratory was consistent with no longer hairs being found during the cabin search of the Blade.
The searches both on The Blade and in the Laboratory, would both of necessity be looking for long blond hairs as Amelia Hope had long hair which was dyed blond. No New Zealander would not have seen the released photos of her and Ms Vintner would not be an exception. This presented potential ‘confirmation bias’ as set out in the Sean Doyle report and the PCAST, which if known may have been reason to reject the evidence or provide a warning to the Jury that the contemporary model is that the blanket and hairs would be sent to a laboratory as being from an anonymous source. The same would apply to the brush hairs being sent to a different laboratory without historical evidence of source resulting in no opportunity for confirmation bias or contamination.
The absence on DNA results of 11 hairs should be compared to 2 hairs not found earlier which did give DNA on a probability basis.
The 2-hairs were found the same day sample hairs taken from a comb in the Hope home were delivered to the laboratory by police. These hairs were also not counted but do have a specific reference point in that after the ‘brush’ bag was opened on the same work space as the blanket hairs were being re-examined the blanket hairs were suddenly found to have contained 2 longer hairs than which had been among those hairs that had been measured previously. The probability of 2 hairs being found on the same day as a third search of the blanket hairs when it happens that further hairs from a separate source were taken to the same laboratory and resulted in a ‘fresh’ find on a 3rd search of the blanket hairs is also a dominating fact for any probability testing.
The hairs were never positively identified as coming from Amelia Hope but could have been from her sister who ‘shared’ the same brush (check this detail) or any other female in their same mitochondrial line.
Hair DNA tested is inconsistent throughout the length of a hair and according to the area from where the hair originated.
That Ms Vintner of the ESR in cross examination confirmed that ‘contamination (of the hairs) would have to be considered.’
From a correspondent:
First they were bleached blond, one was 6 inches long 150mm, the other 8 inches 200mm. In previous searches of the hairs and tiger skin blanket, the longest hairs found were 3 inches 75mm. 11 were chosen including both brown and yellow blond hairs for DNA testing, none of which returned a positive result from the DNA test.
The only DNA test that tied the hairs to Olivia was the $70,000 mitochondrial(mDNA) tests done in the UK but it only proved the hair came from one or other of the two girls no more. The nuclear DNA testing was useless and in spite of some junk science, the multiplying of two totally separate tests both with out reagents to confirm results meant the hairs could have come from Amelia or Olivia or any other person sharing the same mDNA.
The other test done, one of the hairs was microscopic comparison where the scientist would claim that hairs matched the sample hairs from the Hope home. Again, this is now totally discredited as DNA has resulted in exoneration's where hair comparison was a major factor in the conviction.
Tests done by the NAS for the US Dept of Justice revealed that the "experts" could not even reliably match two halves of the same hair, and could match hairs from totally unrelated people from different parts of the Country. Microscopic comparison can identify between races and parts of body hair, but head hairs vary depending on the part of the head they are from.)))