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To book a lie detector test, call 0203 370 0033 / 01493 770071. Alternatively fill out the enquiry form on the contacts page.

All lie detector test advice is free. Lie detector tests carried out throughout the UK.

The lie detector test works by recording changes in a person’s physiological conditioning during questioning. These
changes are traced directly onto the polygraph charts in order that they can be reviewed. Some of the changes that
occur may replicate those that have been linked with truth or deception for many years. These physiological changes
have been the subject of various research projects and qualified examiners have undertaken many hours of lie
detector chart analysis instruction to interpret them.

The lie detector charts are generated
by attaching four components to the
subject.

Pnuemograph
Two rubber pnuemograph tubes are
placed around the subject’s upper
chest and abdomen on the outside
of their clothing, these record
breathing and movement.

G.S.R
The GSR or Galvanic Skin Response
is produced by placing two finger
plates across fingers on one of the
subject’s hands. These trace changes
to the skin's sweat gland activity
during the examination.

Cardiosphygmograph
This component traces changes to
the subjects relative blood pressure,
pulse rate and pulse strength and it
is similar to the pressure cuff your
doctor uses when taking your blood
pressure.

A lie detector test usually takes around 2 hours from beginning to end and
consists of three different phases; pre-test interview, collection of charts,
and analysis of charts. The lie detector test is the most fool proof method
of testing for lies.

Pre-test interview & formulation of questions
During the pre-test interview the examiner will explain how the lie detector
Test works, discuss the issue and develop and review all questions to be
asked on the polygraph test. This stage is normally the longest to complete,
and will take anywhere between 45 and 90 minutes.

Collection of Charts
During this phase the subject will be attached to the polygraph components.
The set of questions which were developed during the pre-test interview will
be asked 3 or 4 times.

Analysis of Charts
Once the examiner has collected the charts, he will analyse the results
before giving a decision as to the subject’s truthfulness or deception to the
given issue.

What Questions Can be Asked?
The examiner will work with you to construct questions that cover the test
issue as well as meeting the strict rules for the latest polygraph techniques.
All questions are discussed with the subject thoroughly before the test
commences and will be answered "yes" or "no".

How reliable is a Lie Detector Test?
There is no doubt that the lie detector is highly reliable, providing the examiner
using it is properly trained and the technique they use is validated. The
American Polygraph Association (APA) has gathered over 200 studies on the
subject, you can view further information at their web site www.polygraph.org