#2 – Facial Expressions
There are a few giveaway facial tics and expressions that will let you know someone is not being completely honest. The first is their eyes: it is widely believed that liars blink a lot and avoid eye contact. This can be true, and if you notice this behaviour it is a clear sign of dishonesty. However, some people go the opposite route: they stare at you intently without blinking, often in an attempt at intimidation or proving their honesty. If someone’s eyes are doing strange things, one way or the other, it’s worth taking what they say with a pinch of salt.
You should also look out for “micro-expressions”. A person telling a lie is effectively playing a part, and sometimes the mask will slip. If you notice fleeting signs of discomfort or anger on their face, be cautious.