The toxicologist said that the Death cap toxin is hard to detect, with a small time frame of detection in urine. IIRC Don and Ian tested positive, Heather and Gail were negative but the lunch guests weren’t tested on arrival, as Death Cap wasn’t initially thought to be the culprit - it was the meat that was suspected.Timelinewise, it fits with her going back home. She needed her son out of the house for some reason. I wonder what she told him. Drops him off and says....?
I keep wondering, if they weren't tipped to mushrooms in the first place, would they have ultimately isolated the Death Cap toxin, would it have been discoverable later?
Did it have allure as a vanishing poison?
JMO
EP’s urine wasn’t tested until 51 hours after the meal, so a negative toxin test isn’t that meaningful. I think the defence will try to argue that she ate the tainted mushrooms but was lucky, maybe because she was young and supposedly healthy