Step 5: Body language
Fake smile = lying
Eyes getting bigger and eyebrows raising= lying
Fidgeting = lying (most likely)
Sweaty hands or head= lying
Itchy head or face = lying (most likely)
Walks away from confrontation = lying
Angry during confrontation = lying
Cant stand still or sit still = lying (most likely)
Not looking at you directly = lying (most likely)
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A fake smile can be detected based on how the eyes look. Eyes that wrinkle together at the outside is a sign of a genuine smile. Fake smiles don't usually engage the rest of the face.
The eyes enlarging and eyebrows raising can come from surprise or fear. Surprise and fear look similar, except in surprise there is more change in the lower face. The fearful face is less changed from the eyes down.
Sweaty hands and face can really be anything. They are not indicative of lying.
People do show an apparent itch on different parts of the face or neck.
People getting angry and walking away from confrontation may not actually be from being dishonest. People that are telling the truth actually get angry when someone challenges their integrity.
Someone not looking at somebody directly could arise from shame, embarrassment, or guilt.
If you want a realistic show on nonverbal communication, check out "Lie to Me". It's loosely based on the life of Paul Eckman, the "discoverer" or micro expressions. Also, read anything by Paul Eckman. He's incredibly knowledgeable and explains what to look for in deception detection.
The most important thing to remember is that you have to establish a baseline before you start telling someone they're being deceptive. For example, some people are natural sweaters. Some people always look away from people when they're talking, etc.
Hope this helps clarify this.