OK... How did they measure "rapport"? The most important relationship he measured was between “yield” – information elicited from the suspect – and “rapport” –

OK... How did they measure "rapport"? The most important relationship he measured was between “yield” – information elicited from the suspect – and “rapport” – the quality of the relationship between interviewer and interviewee. For the first time, a secure, empirical basis was established for what had, until then, been something between a hypothesis and an insider secret: rapport is the closest thing interrogators have to a truth serum. Above all, rapport, in the sense used by the Alisons, describes an authentic human connection. “You’ve got to mean it,” is one of Laurence’s refrains.