Why wouldn’t you have to be an expert? The doctors in the hospital in the BA case didn’t understand how to interpret the results at the time properly. Yes we all think it’s a pretty simple concept now but we have been discussing for the past 4 + weeks, if you don’t specialise in this area or come across it very often why would you know ? Taking blood sugar readings and understanding the effects of hypoglycaemia isn’t the same as understanding specialist blood results that can rule out a natural cause. I’m not saying someone didn’t know, perhaps they did and thought tit someone fucked let’s cover it up. But we can not just assume they understood something that is actually pretty complex. My thoughts are IF they did know how to interpret the results they wanted to avoid an investigation and put it down as an accident (fairly sure that was actually stated), or the other explanation was they just didn’t understand what the result meant fully. Either way it doesn’t rule out letby, just highlights, the hospital failed to act at the time.