How you detect lying without catching them red handed?

I can detect lying by assessing someone elses intelligence and if they truly do seem like a smart enough person and saying some easily debunkable or google-able facts... well to me it does come across as if they are lying, attempting to pull one over on others, or have fallen for an over all narrative and unknowingly spreading it.

Another way to put it would be if they do seem to adhere to empiricism (a theory that all knowledge originates in experience) in most areas/subjects but seem to fail miserably in one or more other areas. You would assume most reasonably smart educated people would arrive at the same or similar conclusions but for some reason they do not. It just comes across as sussy to me and does make me think "they know they're bullshitting right? they aren't dumb."

And most especially so if they refuse to show their work so to say in how they arrived at their conclusions... thats a big red flag to me.

Anyways thats how i do it.

How you detect lying without catching them red handed?
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i mean more when you can't see them face to face. only through words.
How you detect lying without catching them red handed?
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