The third edition of this perennial bestseller continues to cover the principles of kinesics, including how to determine behavior from speech and body language, and how behavior is often exhibited in written statements. Addressing current issues faced by professional investigative interviewers, this edition adds chapters covering the electronic recording of interviews, tools of influence and compliance, interviewing psychopaths, interviewing children, and false confessions. The author also discusses new techniques based on current research and the increased demands for expert testimony to be scientifically based. This edition also provides new photographs and updates existing ones.