6. They tend to stand very still

It’s widely known that people fidget when they are lying, but experts say that you should also look out for people who aren’t moving at all. According to them, this may be a hallmark of the primitive ‘fight,’ rather than ‘flight,’ response. Basically, the body positions itself and gets itself ready for a possible confrontation.

When you speak and have a normal conversation, it’s natural to move your body around in relaxed, subtle, and, for the most part, unconscious movements. But if you notice a catatonic, rigid stance free of movement in someone who’s talking to you, it’s often a red flag that they may be lying.