When someone is lying their body language shows deception like they try to avoid eye contact, or show subtle physical and behavioral signs.
When someone lies their behavior goes off and inconsistent they will seem unnatural, they will become overly polite or calm or agitated, and show unusual emotions.
Uncertain pitch like too high or too low, often change in pitch and inconsistent tone are other ways to spot a liar.
When someone lies,they try to give too much detail and over explain to make their story appear more believable and realistic.
If someone is lying, they are likely to hesitate and take time to respond, as they take time to make a realistic story.
When someone lies they avoid or refuse details about the specification and constantly try to change the subject.
A lier tries to avoid eye contact while telling lies or looks away while speaking.