Polygraph Test, Lie Detector Test, UK

THE POLYGRAPH TEST

The Polygraph Test, (more commonly referred to as a Lie Detector Test) is an in-depth procedure conducted by trained and experienced polygraph examiners, using the latest in computerised polygraph systems and validated test techniques. A test can typically take a minimum of 2 to 3 hours, depending on the nature of the test. The term “polygraph” derives from the Greek words poly (many) and graph (writings), “many writings”.

WHAT DOES THE POLYGRAPH TEST INVOLVE?

The test consists of four phases, the pre-test phase, chart collection phase, test data analysis and the post-test phase. During the chart collection phase the polygraph traces changes in persons physiological condition during questioning, (the questioning focuses upon a specific incident or event). On completion of polygraph test, the examiner will analyse the collected charts before rendering a decision as to the examinees truthfulness regarding the specific event.

PRE-TEST

The pre-test interview starts with the examinee completing a medical assessment and providing a statement of consent (permission to conduct the test). The examiner will give an overview of the testing procedure and what to expect. This includes an explanation of the polygraph system, sensors and test techniques which will be used.

The examiner will discuss the test issue with the examinee and gather background information to develop the test questions. Test questions will be discussed fully with the examinee prior to the start of the test.

CHART COLLECTION

The second stage will see the examiner attaching sensors to the examinee and will include an explanation of each of the sensors. During the chart collection phase, data is collected by the computerised polygraph system and sensors which traces changes in a person’s physiological condition during questioning in relation to a specific incident or event.

TEST DATA ANALYSIS

On completion of the chart collection phase, the examiner will analyse the results and will usually provide an opinion as to the truthfulness of the examinee regarding a particular issue. Where appropriate, a verbal result may not be given as a second opinion may be required.

POST TEST

The examiner will usually provide the examinee with a verbal result and where appropriate will offer the examinee an opportunity to explain the physiological responses to the questions presented during the test. A written and fully verified report (quality controlled by a second examiner) will be provided at no additional cost. For the convenience of our clients, reports can either be posted or emailed.