poligrafica mancini Reliable & valid lie detector, polygraph tests. How reliable is a polygraph test?

Reliability and validity of polygraph or lie detector exams is a recurrent issue. A little research will, however, show contradictory answers to this question. Why is that, why is it almost impossible to get an accurate answer ?

This video tries to answer that very question.

Why are there differences in reliability percentages of a polygraph test? - How reliable is a polygraph test?

It is quite common when looking for the reliability of a polygraph test to have contradictory percentages, some say the reliability is 50% and others talk about 100%.

This disparity usually lies in what the % it refers to.

Let's see:
In a polygraph test we have two elements:

1. A polygraph instrument
2. A polygraph test

The polygraph instrument, if everything is working fine and is applied in a controlled environment usually records the physiological activity of a person with a high degree of reliability. It is not unreasonable to say that the readings are 100% true to the physiological reality of that person.

The variables that affect reliability of the instrument are:

- Good functioning instrument
- Adequate premises
- Experienced technician
- Physically and mentally fit examinee

Sometimes it is possible that in some people the measurements are weaker because the person is taking medications that may have an influence on nervous system or that the person is physically tired or has just naturally less response on a certain reading. Another situation may be that there are distractions that can distort the readings but an instrument registering false physiological activity is very unlikely.

We can say that if the instrument is working, the readings are reliable, we reach an almost perfect percentage of 99% - 100%.

Now when we talk about the reliability of a polygraph test, the percentage of validity that we can give when we say that a person is lying or not, this percentage is affected.

Why is this percentage different from the reliability percentage of the polygraph instrument?

Because new variables enter the equation that will increase the margin of error.

These variables are:

- Correct analysis of the issue to be examined
- Intellectual capacity of the examinee
- Emotional state and maturity of the examinee
- Use of appropriate techniques for different possible issues
- Correct interpretation by the technician of the registered physiological information

However, when we talk about percentages of reliability of a polygraph test, the only percentage we can use are those that have been proven by field or laboratory studies. These studies are the only guarantors of a proven reliability.

The current studies of the different techniques validated by the American Polygraph Association point to success rates of between 86% and 91% depending on the technique used for tests designed for the detection of deception.

In summary we can say:

Reliability of the polygraph instrument: 99.9% - 100%
Reliability of a polygraph test: 86% - 91% depending on the technique used.

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Video produced by Amável Sanches, forensic psychophysiologist, polygraph expert, member of the American Polygraph Association, Primary Polygraph Instructor, major in forensic sciences by the Autonomous University of Barcelona.

For more information please visit our website or send us an email:
Web: http://bearforensics.com
Email: info@bearforensics.com

Thank you,
B.E.A.R. FORENSICS

poligrafica mancini Reliable & valid lie detector, polygraph tests. How reliable is a polygraph test?
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