Judging Honesty by Words, Not Fidgets

[groovedaddy]

(Remember the new technology used at airports and elsewhere to identify terrorists by scanning their faces? Doesn't this story seem to discount the validity of such practices? gd)

Before any interrogation, before the two-way mirrors or bargaining or good-cop, bad-cop routines, police officers investigating a crime have to make a very tricky determination: Is the person I’m interviewing being honest, or spinning fairy tales?

The answer is crucial, not only for identifying potential suspects and credible witnesses but also for the fate of the person being questioned. Those who come across poorly may become potential suspects and spend hours on the business end of a confrontational, life-changing interrogation — whether or not they are guilty.

Until recently, police departments have had little solid research to guide their instincts. But now forensic scientists have begun testing techniques they hope will give officers, interrogators and others a kind of honesty screen, an improved method of sorting doctored stories from truthful ones.

The new work focuses on what people say, not how they act. It has already changed police work in other countries, and some new techniques are making their way into interrogations in the United States.

In part, the work grows out of a frustration with other methods. Liars do not avert their eyes in an interview on average any more than people telling the truth do, researchers report; they do not fidget, sweat or slump in a chair any more often. They may produce distinct, fleeting changes in expression, experts say, but it is not clear yet how useful it is to analyze those.

http://www.nytimes.com/2009/05/12/science/12lying.html?ref=science