@Graybeard : The context of my question is that if enough people thought it was a possibility, even if it doesn't turn out to have much of a bearing on the case, would it not be a good idea to look into remedying the situation - whether that be via training or technology?
I've got no answers to your other questions, other than a nagging suspicion that for all our knowledge, nature will always find a way of surprising us - sometimes not in a good way.