"Can you explain why you are so invested in this case? It would be interesting to understand"
You're coming across as a bit patronising here - just fyi - very 'man on mums net' vibes, but I'll answer you.
I think this case is of historical importance. If it is a Miscarriage of Justice (and I now believe that this is exactly what it will be shown to be) then it exposes deep rot at the heart of several seriously important British Institutions - The Judiciary, The police, the NHS, even the media. The repercussions of that spread across the whole society, far beyond the families involved, or Lucy Letby herself. This affects all of us deeply, as we rely on these institutions for our (and our loved one's) safety, security, and liberty. I don't know why everyone isn't invested, frankly, because the stakes are very high for all of us.
I'm also currently on bedrest for health reasons, so having followed this case closely for over a year, I decided to make a thread about it. Is that okay? 😂
"I think it is tremendously complicated and you need both a good knowledge of neonatal intensive care and statistics to fully understand it."
I fully agree that it is tremendously complicated. Do you think I'm unable to comprehend it for some reason? Have I said something that you find to exhibit my poor grasp of the facts? It would be interesting to understand.
"As a layperson, I probably do have a better grasp than most (mathematical science degree) but I still couldn’t be in any way sure one way or the other."
Your implication here is that I do not have as good of a grasp as you. I assure you that I have a very good grasp indeed. This is an odd thing to say. Have you found fault with my explanation of the faulty stats in the latest Panorama? If so, can you illustrate that? I am certain that I am correct, and I don't want to bog the thread down with maths for the sake of other people, but by all means show me otherwise.
Nobody can be 'sure'. That's not how law works. Or medicine for that matter. Does the evidence stack up or not? You aren't sure, that's perfectly fine. I am, at this stage, pretty sure. This is based on extensive research, which I assure you I'm perfectly well placed to understand. Others are free to have their own opinions.
"It is up to the defence to convince the jury that there is reasonably doubt and, certainly in the first trial, they failed to do that."
I am aware. Are you arguing that procedure is more important than justice? If so, I don't agree.
"This was always a trial based on layers of circumstantial evidence."
Another way to say this is: 'This was always a trial that had no strong evidence"
Circumstantial evidence can be very strong, but here it was not.
"Each individual piece of evidence was always subtle and debatable"
No individual piece of evidence is worth anything if there is no evidence that any murders actually occurred. Babies, sadly, do die in NICUs. There was a nationwide death spike that year. Other hospitals had worse spikes and no one is hunting for a serial killer nurse there. It's not the same thing as finding a body in the street with stab wounds.
"but, layered on top of each other, they convinced a jury."
Yes, and a jury is not a magical group of wizards. They are a group of ordinary people, like any of us, perhaps some who are smarter, perhaps some less so. Juries have made the wrong decision in every single miscarriage of justice, ever. So appealing to their authority in this context is invalid. Also, they weren't all convinced.
"For instance, you mentioned the insulin test being 98% accurate. This means the chance of two separate tests both being inaccurate is 2%x2%=0.0004 or 4/10,000 (unless the results were somehow correlated). Is 9996/10000 beyond reasonable doubt?"
I think your working is a little off. Your “2% × 2% = 0.0004” claim makes the same mistake Roy Meadow made in the Sally Clark case. Meadow multiplied the probability of one cot death in a family by itself to get the probability of two, assuming the events were independent. He ignored that both deaths occurred in the same household, so they shared risk factors that made them statistically correlated.
Here, you multiply the 2% false positive rate (which is of course a rough number, but put that to one side) for an insulin immunoassay by itself to get the probability of two false positives, assuming the tests are independent. But they aren't independent. Both results came from the same hospital, lab, and testing process, meaning any systematic issue could affect both results. As in the Sally Clark case you've wrongly assumed independence when correlation was likely, you've ignored the base rates - Dr Brearey searched through years of hospital records, through all of the babies that were in the NICU on any of Letby's shifts, increasing the chance of finding two “rare” results. So, to answer your question, I don't think these two tests are proof of exogenous insulin beyond reasonable doubt at all.
"But it is not just these two tests. There was a host of other evidence, all questionable. But the total picture?"
Show me a single thing that stands up by itself. If nothing stands up by itself then there is no case. A whole pile of broken links doesn't somehow make a strong chain, it makes...a whole pile of broken links.
"The defence, of course, did (will again maybe) depend on challenging the minutiae of the evidence, as per the OJ Simpson defence."
This is nothing whatsoever like the OJ Simpson case. There were two bodies covered in stab wounds - someone killed them. There was a clear history of domestic violence, some of it very extreme. There had been previous death threats. That's where you're starting from. As I've already explained this case doesn't start with definite murders. Babies die in NICUs. There was a nationwide death spike. Men kill their wives not infrequently. Nurses are very rarely serial killers. Also, Lucy Letby isn't a multi-millionaire retired NFL star. She's an ordinary nurse from a cul de sac. Anybody working for her is doing it pro bono out of professional and moral integrity. It's ludicrous to compare the two.
"As I said, up above, it is unlikely we will ever 100% know and an innocent woman in jail for life is a horrible prospect."
It is a tremendously horrifying prospect, as is ignoring what this case says about the extreme issues with our most vital public institutions. The case doesn't exist in a vacuum. It has broad repercussions for our society if she is actually innocent.
"But we don’t have any better mechanism than a jury trial, so we have to go with it after all the avenues of legal defence are exhausted."
Thankfully the avenues of legal defence have not been exhausted. The case is currently under review with the CCRC. Let's see what comes of that.
In the meantime I'll continue talking about it if I wish, assuming that's okay with you.