IR for lie detection?

I was reading an article about the proper ways to deal with children when lying. I found an interesting part of it that stuck out to me with regards to IR.

Barry McManus, who served for ten years as the CIA’s Chief Polygraph Examiner and Interrogator, is one of the world’s foremost authorities on “leakage” - which is the physiological response when you lie (sweaty palms, lack of eye contact etc.) Going further, he notes you have about 50 muscles in your face, and a few involuntarily contract when you are deliberately saying untruths. Also, for what it’s worth, your nose temperature rises.

So could some sort of testing protocol (standard) be adopted for lie detection that is consistent and repeatable? Could we all be possibly missing a very simple application to perform that no one is marketing or doing currently? It would be interesting to see if someone could set up a business in doing this along side a private polygraph specialist.

My biggest question is, how much does it rise? If it is less than 2% of normal human body temperature, or observed temp prior to the lie detection, then a good lawyer could bring in the camera +/- 2% accuracy of the camera to create doubt.

Yet another potential application.

Jason Kaylor
AC Tool Supply
Net Zero Tools
Arizona Infrared Inspection Services

Can we nose test it on John:p

This is been around for a while.

What you should understand (outside of infrared thermal imaging) is that these tools such as the polygraph are not used to prove that a person is lying or not per se. The use of a polygraph is an interrogation tool.

In other words it is not a “he’s lying” yes/no. It is a change from a controlled condition (telling the truth) to what happens when you tell a lie. Just like temperature differentials with thermal imaging the polygraph examination shows changes in physical body reactions under stress.

The fact that the needles on a polygraph machine start jumping off the chart is enough to offset a suspect and get them talking to try to explain the reaction.

Testimony of the polygraph examiner is based upon his experience that physiological changes occurred when certain questions were answered. This is used along with other circumstantial evidence to build your case upon.

They basically come back and say: “Jason, we have a problem with question number seven. Let’s go back over that again and find out what the problem is, there must be a logical explanation. Maybe we need to rephrase that question.”.

The testimony generally covers the entire scope interview rather than a specific question. Polygraph examiner simply indicates that in his opinion the suspect was showing deception during the interview.

Hey, there you go!

You bad! :mrgreen:

You might have trouble establishing a baseline.

Woooogh! Double “Bad”!