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If you as a liar are good at detecting liars, then wouldn't it be logical that you could detect honesty as well, being the opposite?

Well then take the opposite. What about honest people, do they recognize honest people better? I don't know, just asking, wondering. It could even be that honest people recognize honesty better than liars, while at the same time liars are better lie detectors.

Then there has to be a middle group I guess - what are they?

Presumably, liars don't lie all the time, so they do both lying and honesty enough to be able to tell the difference.

I also don't really know, but it sounds plausible :)

The difference: lies pretend to sound honest, while honesty doesn't pretend to sound like lies.

Also 'crazy' people were more apt at recognizing other people with mental problems that the doctors

For one thing, you can never be sure if they really detected a liar or they are just lying about it. ;-)