The document discusses body language cues that can indicate whether someone is telling the truth or lying. It recommends starting an interview with general questions to establish a baseline of the person's truthful body language. Signs of potential deception include eye averting, microexpressions like subtle smiles that contradict the message, and inconsistent gestures like nodding no while saying yes. Other signs are fidgeting, neck rubbing, looking at watches, and positioning furniture as barriers.