Key extract from Private Eye article:
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THE insulin babies (F and L) were the turning point in the meeting and, later, the trial. Hindmarsh, Evans and Bohin all agreed the cause of the abnormal test results and hypoglycaemia in both babies was "exogenous insulin administration, for which there was no clinical indication".
Hall decided to "defer to the expertise of Hindmarsh" in both cases and - even more damning for the defence - Rahman agreed with the prosecution statement. The prosecution had their big win. There was no clinical biochemist to argue that the immunoassay test for insulin in neonates is simply not reliable enough to use in a murder trial, that the machine used was not properly calibrated for C peptide, and that if the insulin levels had truly been that high, the blood sugars and potassium would have been much lower.
Experts on both sides agreed "the management of the hypoglycaemia was poor". But they failed to consider the obvious: that the hypoglycaemia occurred because the management was poor.
Sick or septic neonates with high glucose needs had misplaced IV lines and inadequate infusion rates. It did not need insulin injections to explain the clinical findings, but Hall and Rahman weren't able to.
For Baby L, Hall did at least ask how insulin could have plausibly been administered to cause hypoglycaemia for 53 hours covering times when Letby was absent. Hindmarsh theorised it was added into the drug port of multiple nutrition bags. So why did it only affect one baby at a time?
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LETBY'S barrister, Ben Myers KC, tried to call Hall to the stand at the same time as Evans, to debunk the air embolism and air in the stomach claims which account for all the murders.
The prosecution refused, and after the powerful expert descriptions of the liver injury and insulin poisonings, there presumably seemed little point in putting Hall on the stand to admit he had deferred to Hindmarsh. Indeed, the prosecution called for Hall's written evidence to be heard, as they knew what he'd signed up to.
At the meeting, Rahman said that "air embolus cannot be excluded", and Hall said: "If the collapse was due to air embolus, it could have been accidental." Imagine the field day the prosecution would have had.
Safer not to call your experts and hope others who are more court-savvy come forward for the appeal. Hall stuck to the legally binding statement and was never called. Evans was called and promptly diverted from the statement, changing his mind on multiple occasions with the judge's permission.