If detecting falsehood and discovering truth are not the same skill in practice, then practicing honesty probably makes you better at discovering truth and worse at detecting falsehood.
It seems to me that the hard part of both is being “more confused by fiction than reality”, and that the only relevant additional concern when detecting falsehood to have a reasonable prior on deliberate deception.
It seems to me that the hard part of both is being “more confused by fiction than reality”, and that the only relevant additional concern when detecting falsehood to have a reasonable prior on deliberate deception.