Questions and answers about our Polygraph / Lie Detector testing service. Click on the question to receive the information required.

Q, How does the Polygraph / Lie Detector Work? 
Q, How Reliable is the Polygraph / Lie Detector Test?
Q, Can the test be cheated?
Q, How many questions can I ask?
Q, How Long will the test take to complete?
Q, Where will the test take place?
Q, How much will it cost?
Q, How do I know the examiner I choose is qualified?


How Does The Polygraph / Lie Detector test Work?

A polygraph / lie detector examination 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 Polygraph 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; these record breathing and movement.
  • G.S.R - The GSR or galvanic skin response is traced by placing two fingerplates across the subject's ring and index finger of the right hand. These trace changes in skin resistance during the examination.
  • Cardiosphygmograph - This component traces changes in the subject's relative blood pressure and pulse rate, and is similar to the pressure cuff your doctor uses to take your blood pressure.

While the subject is attached to the equipment described above, they are asked agreed and carefully constructed questions, and in replying the body generates tracings on the polygraph charts. In analysing these tracings, the examiner reaches a conclusion to the subject's honesty regarding the issue.



How many questions can I ask in the test?

Question Formulation - only carry out polygraph tests using the latest question techniques. These techniques are widely accepted in Law Enforcement throughout the USA, Canada and many other countries.

The latest techniques allow a maximum of three relevant questions within a single test.

All questions are fully reviewed and agreed with the subject before the test commences. The test can only be completed with the examiner and subject present, no other person is permitted in the room at the time of the examination.
All questions must be direct and pertain directly to the issue under examination. Questions cannot be mixed in issue on a single test. I will also only ask relevant questions that relate to one issue. I cannot ask what a person thinks or feels but can ask what they have done! For example:

Example of A good question:
                          Since the day you were married have you had sexual intercourse with any other woman than your wife?
Example of a bad question:
                          Do you love your wife?


How long will the test take to complete?
A polygraph examination typically takes around 2 hours from beginning to end, and consists of three different phases; pre-test interview, collection of charts, and analysis of charts.

Pre-test interview - during the pre test interview I will explain how the polygraph works. I will then discuss the specific issue, develop and review all the questions to be asked on the polygraph test. This stage is normally the longest to complete and can take anything from 45 to 90 minutes.

Collection of Charts- During this phase the subject will be attached to the polygraph. The set of questions, which was developed during the pre-test interview, will be asked several times. During this stage only the examiner and subject will be present.

Analysis of Charts- Once I have collected the charts I will analyse the results before giving a decision as to the subject's truthfulness or deception.



Can the polygraph test be beaten or cheated?

Provided the examiner conducting the test is trained and qualified it is improbable. The polygraph is a medical instrument that records changes in a persons condition whilst they answer questions. If a person engages in behaviours in order to distort the polygraph tracings, it becomes evident to a trained examiner. I use the latest polygraph instruments and techniques that include state of the art countermeasures equipment to assist us in catching people who are attempting to cheat the test. 


How much will a Polygraph / Lie Detector test cost me?

Lie detector tests at our office cost £400. If you would like a test at your location we can travel to you in most areas for an additional £75 I am happy to discuss your requirements in TOTAL CONFIDENCE. I answer calls 7 days a week up until 9pm so for an accurate quote please call me on 0161 3340021 or email by clicking here


How do I know that the examiner I choose is Qualified?

Quite simply you should ask to see evidence that the examiner is a member of the American Polygraph Association or the International society of polygraph examiners. If they are a member of either of these associations you can be sure that they will have attended and graduated from an accredited polygraph school. The examiner will be able to show you evidence of membership when you attend your examination. 

Don't be afraid to ask where they qualified and what year they attended the training school. A qualified examiner will be happy to answer your questions directly and factually. All UK Lie Tests are fully qualified and will be happy to verify this with you.


Where will the test take place?

I am based in Manchester and can travel to you in the North of England, Midlands and Wales. I also have associates that cover the south of England. In most cases I can test in your home or if your problem is a business issue I can test at your business premises. You only need to supply a quiet distraction free room for me to test in. During the test itself the examiner and person taking the test (subject) must have privacy, this enables me to ensure that the subject is focused on the test issue without distraction.

If you do not want the test at your location you are welcome to attend my offices in Manchester.

My fee's include all travel expenses to your location anywhere in England, Wales and Scotland, for tests outside Mainland UK we charge our basic flight/ferry costs. For an all inclusive quote please call 07771 656253


How reliable is the Polygraph / Lie Detector test?

The American Polygraph Association (APA) has gathered over 200 studies on the subject of test accuracy.

Research results regarding polygraph testing vary depending on a number of factors. To help achieve a high accuracy rate the examiner you use should be a properly qualified individual using an accepted technique. It is important to understand that expecting one accuracy figure for polygraph testing accuracy is not realistic due to the fact that each test conducted is unique and there are many variants such as Test issue, Technique used, Question scope etc. It is also my experience that while examiners tend to quote the higher end accuracy figures from the body of research, anti polygraph individuals quote the lowest end figures often relying on out of date research. My recommendation is to study the APA meta analysis (2011) which is located on the American Polygraph Association website .


For further information about polygraph lie detector tests please download pdf file