I would think that anyone with half an eye could see whether a person is lying or not. It's not a gift,it's a psychological reaction of the person who's being lied to,such as " built-in " interpretation,in an adult. It depends how alert one is too.
It's easier to lie if there are distractions such as flicking pages over of documents you're handling, as police do while still talking.
Prisoners, as well as police,when being questioned,should both be made to put the palms of their hands flat to the table,to prevent fiddling or gesticulating as both actions are tantamount to avoiding the truth as a way of diverting from it. There's no need for physical actions when telling the truth. Eyes transfixed to your opponent and no raised voices. Above all,no tears,that's play-acting. There's no need for tears when you're telling the truth.
Eyes going all over the place is a bad sign,but if eyes are force-fixed,they'll start to water and that's when you get a hint that all isn't as it seems. It's caused by tension which is another giveaway. People should be at their more relaxed stage when telling the truth as they've literally nothing to worry about so no build-up of tension. In fact,the more laid-back the better.It annoys everyone because of your confidence and surety of innocence.
I think an air of pomposity and arrogance covers that.
