“While del Balzo spoke, Brunetti turned off his ears and observed the speaking man, a habit he had developed during years of interrogating suspects, listening to witnesses, or sometimes hearing his children explain their school grades. Usually, some uncontrolled part of the bod–-a foot, a finger, or even a nose--gave evidence of the state of affairs inside the speaker; further, the non-listening listener could not be lulled by flattery or charm, nor by persuasive numbers. He simply watched a person, looking for evidence that what they were saying was not what they knew or believed.”
Book:Give Unto Others