How does a Lie Detector Test work?2018-05-24T16:58:24+00:00

How does a Lie Detector Test work?

The lie detector test records manifestations of a person’s nervous system from at least three systems in the body whilst questioned about concerns of a specific issue, incident or event. The examiner will analyse the charts collected and render an opinion as to the persons truthfulness.

A polygraph examination consists of four phases and will typically take between 2 to 3 hours to complete.

The four phases of a polygraph examination are known as the pre-test, chart collection, test data analysis and finally the post-test phase.

Pre-test phase.

During the pre-test, the examinee is required to complete a consent form and medical form.

The examiner will provide the subject with an overview of the examination and testing process and conduct a pre-test interview. The interview will provide the examinee with an opportunity to discuss their circumstance with the examiner in greater detail and to assist with test question construction. It is imperative to be truthful, open and honest with the examiner as any undisclosed information may affect the outcome of the test results.

Chart collection phase.

Sensors will be attached to the subject and the test questions reviewed. The examiner will go onto administer and collect a number of charts. The number of questions asked and charts collected will vary depending on the format of the test used and the test technique.

Test data analysis phase.

On completion of the chart collection phase, the examiner will review the data collected and analyse the charts. An opinion of the examinee’s truthfulness regarding the specific issue, incident or event will then be rendered.

Post-Test phase.

The examiner will provide the examinee with a verbal result and where appropriate the examiner will offer the examinee an opportunity to explain physiological responses to the questions presented during the test.

Further FAQ’s

A lie detector test is also known or commonly referred to as a polygraph test or polygraph examination. It is one of the most powerful, robust and useful scientific tools in truth verification or the detection of deception regarding a specific issue, incident or event.

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Although no forensic testing of any kind can be guaranteed to be 100% accurate, research gathered by The American Polygraph Association has suggested that qualified polygraph examiners can achieve an accuracy of 95% to 98% when an examination is conducted in an accurate manner, with issue-specific questions and using validated polygraph techniques.

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In short, lie detector test prices vary throughout the UK ranging from £395 to £695 for a specific issue test with an average test costing of around £550.

Lie Detector Test Costs can vary depending on several factors from location, examiner experience, third-party providers, and the number of tests required. Therefore, it is imperative you check the credentials of the polygraph examiner and company before committing and ensure you are asking the correct questions.

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There are several factors to consider before you choose a Polygraph Examiner. These include primary training, overall experience, continuing education and the use of the latest computerised equipment & validated test techniques. In each section below, we have provided a brief outline as to what checks and credentials should be undertaken or verified.

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