A wise old friend of mine was was a police interrogator gave me some tips.
People who aren't in love with the facts are lazy thinkers and offer their version of what is true as beyond question.
When you begin to ask for back-up evidence, examples, particulars and specifics an intellectually honest person gives them without becoming angry or defensive. A bull-shitter can't stand being challenged.
Saying what you think is true allows you to remain humble.
Making stuff up and getting called out on it makes you pissed off!
The number one trait a police interrogator looks at is "attitude" toward being asked to verify what you say.
Quick tempered=liar more often than not.
Not an absolute by any means--but, a handy tool.
And speaking of absolutes--another thing he told me was extremely interesting!
When a person is deliberately lying while trying to convince you they are telling the truth they do two things invariably.
1.They use more formal language. "I did not" instead of "I didn't". As in "I did not have sexual relations with that woman, Monica Lewinsky."
2.The liar over-states their own reliableness. "I'm a thousand per cent sure this is true." A hundred percent is plenty:)
Or, "I would never in a million years steal money from......"
Exaggeration and over-formality......intringuing....