Mutually exclusive events. If someone is lying we usually want to know if they're lying. If they are lying we will trust them less.

I haven't thought about this possibility but it makes sense -- the infrastructure is in place for this kind of approach and it's certainly cheaper than the former theory in the first place.

Expertise in one area of knowledge does not equate omniscience

Best of luck to her. Would they want to try performing a typical delivery or a C-section? I would think the latter but I'm no expert.