BBM. This part makes no sense. I don't know how old the children are, but if they're old enough to go to the movies without parental supervision (did they drive, or is the cinema within walking distance?), they're old enough to scrape off their own mushrooms. Plus, I've only seen this dish in photos, and whether it was made as one giant piece or in individual pies, you'd really have to make a mess deconstructing it to remove the mushrooms. And if the poison is that strong, wouldn't it sort of get through the entire dish? Have the police spoken with the children? (I'm having trouble believing anything E has said, but this part really stands out for me.)