Lying
Of all the non-verbal body language that we may observe, being able to tell whether a person is lying or not will stand you in good stead.
Some of the typical signs and signals that a person is lying include:
Eyes maintain little or no eye contact, or there may be rapid eye movements, with pupils constricted.
Hand or fingers are in front of his or her mouth when speaking.
His or her body is physically turned away from you, or there are unusual/un-natural body gestures.
His or her breathing rate increases.
Complexion changes such as in color; red in face or neck area.
Perspiration increases.
Voice changes such as change in pitch, stammering, throat clearing.