The Crown's RNA evidence with respect to the putative brain material was rubbished by two absolutely top-drawer scientists, Stephen Bustin and Marielle Vennemann. With respect to the original immunostain work, several scientists expressed reservations (or there would not have been a retrial IMO). The forensic work as a whole reeks of confirmation bias and third-rate work. Much of it should have been excluded from the trial.

The original pathologists identified a too-narrow window, the gastric smell concept does not appear to have a basis in forensic science. Yet those two point are not equivalent to the statement that digestive contents are completely useless. The lack of any material passing into the duodenum is one piece of information (see papers by Chen et al. and by Hellmig et al.), and the fact that some of the stomach contents were still recognizable is another. A 2013 paper by Patel and coauthors called "Estimation of time since death by gastric contents" covers the latter issue. I would say that they were dead within about 3 hours of consuming their last meal. In other words the prosecution's present theory (that they were killed more than six hours after their last meal) is nonsense IMO.