Frequently Asked Questions…

Lie Detector Investigations are a leading and independent provider of Lie Detector Tests & Lie Detection Services throughout the UK. Our accredited and certified polygraph examiners have graduate from an American Polygraph Association accredited school and have over 16 years of experience within the field. Our examiners undertake periodic training to ensure they remain current and up-to-date with advancements within the polygraph field, including validated test techniques, technology and model best practices.

Our accredited & experienced Polygraph Examiners, Carole London-Williams & Tayler London-Williams are registered members of The American Polygraph Association, The British Polygraph Association and The International Society of Polygraph Examiners. Our examiners undertake periodic, updated training every two years and only use the latest in validated test techniques and computerised polygraph systems.

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

The lie detector test records manifestations of a person’s central nervous system from at least three systems in the body whilst questioned about concerns of specific issue, incident or event. The examiner will analyse the charts collected and render an opinion as to the persons truthfulness. The examination involves an in-depth process consisting of four phases and will typically take between 2-3 hours.  The four phases of an examination are referred to as the pre-test, chart collection, test data analysis and the post-test phase. Only the latest in computerised polygraph systems, sensors & validated test techniques are used.

Two convoluted tubes are placed around the upper chest and abdomen of a person to record respiratory activity. Two metal plates or disposable adhesive electrodes are attached to a person’s fingers to record sweat gland activity and a blood pressure cuff will record cardiovascular activity. A motion sensor will monitor general movements throughout the examination. A finger plethysmograph may also be used to monitor blood volume.

Prior to booking a polygraph examination an examiner will discuss your circumstance at length, in order to gain knowledge of the issue and to achieve an understanding of our clients individual needs. A pre-assessment will also be carried out in order to establish if a subject is medically & mentally suitability to undergo an examination. On the basis of the pre-assessment criteria being met, your appointment will be scheduled and confirmed in writing either by email or by post. Together with our extensive experience within the field and the use of the latest in computerised polygraph equipment, sensors and validated test techniques, you can rest assured the service you receive from Lie Detector Investigations is professional, reliable and of the highest standard.

A lie detector test will typically consist of 4 phases and the duration is 2 to 3 hours. The 4 phases of an examination include the pre-test interview, chart collection phase, test data analysis phase and 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 test technique used.

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.

The lie detector test records manifestations of a persons central nervous system from at least three systems in the body whilst questioned about concerns of specific issue, incident or event. The examiner will analyse the charts collected and render an opinion as to the persons truthfulness. The examination consists of four phases and will typically take between 2-3 hours.  The four phases of an examination are referred to as the pre-test, chart collection, test data analysis and the post-test phase.

A polygraph examiner should be professionally trained and have graduated from an American Polygraph Association accredited school. Membership for The American Polygraph Association is a pre-requisite for any qualified polygraph examiner. However, examiners may have additional memberships with other accredited and approved associations such as The British Polygraph Association or The International Society of Polygraph Examiners. Our polygraph examiners are registered members of the three, aforementioned associations.

Qualified polygraph examiners should only use the latest in computerised polygraph systems and validated test techniques and should complete updated training every two years, as required by The American Polygraph Association.

Any reputable and qualified examiner should be happy to provide his/hers professional opinions in a written report and willingly.

Before choosing an examiner, please ensure the examiner fulfils the above requirements.

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.

Through our robust policies and the application of best practices, Lie Detector Investigations can fulfill and satisfy these conditions by operating to the key conditions, listed below.

  1. Our examiners are fully qualified, experienced and accredited.
  2. We only use up-to-date, computerised polygraph equipment and validated test techniques.
  3. A pre-examination checklist is completed at the time of booking to ensure the examinee is a suitable candidate for testing.
  4. An examination is conducted in an environment which is void of distraction and disturbance, and therefore we do not conduct tests at a person’s home.
  5. We adhere to The American Polygraph Association’s continuing education policy, by undertaking updated polygraph training, every two years.

•  Anyone who is trying to prove their innocence in a relationship issue.
•  Anyone who claims that something has happened to them and they can’t prove it.
•  Anyone who is trying to prove their innocence in a criminal matter.
•  Anyone who has been accused of theft and wants to clear their name.
•  Anyone who has been thought to have lied about something or someone.
•  Employees who have been accused of theft within the workplace.
•  Companies who have experienced financial loss due to security breaches or theft of merchandise can arrange for employees to undergo a Polygraph Test.

The costs of a Lie Detector Test can vary, however you should expect to pay between £400 to £600 for one specific-issue test.

Multiple person tests will cost more however we do offer substantial discounts for multiple tests, as long at they are conducted on the same day. Multiple tests can be conducted more efficiently as we have more than one examiner available which allows for testing to be shared and for us to get the results to you quicker.

For the convenience of our clients, we provide testing at weekends & evenings and at no additional cost. We provide fully-verified, written reports and again, at no additional cost.

To obtain the cost of a lie detector test, you can contact our head office by telephone or by completing our contact form. One of our examiners will be happy to assist you with any questions you may have and will also provide you with a fixed price, no obligation quote. 

Yes, both of our polygraph examiners are female. If however, you would prefer to use a male examiner, we are happy to refer you to another company who can accommodate your request.

Yes, for the convenience of our clients appointments can be scheduled for evenings and weekends and at a location local to you. We do not conduct tests in peoples homes however we will provide meeting rooms facilities usually within a 20 mile radius of your home.

Lie Detector Investigations work to specific key conditions, using robust policies and best practices. Each test is quality controlled by a second examiner and our written reports are also verified, unless otherwise requested by our client.

You can book a lie detector test by calling our head office or by completing our contact form.

Due to the nature of our work, there may be times where we are unable to answer the telephone, however in that instance we would ask you to leave a short message with your name and number. One of our examiners will return your call as soon as possible. Should you complete our contact form, an examiner will usually respond within the same day.

Prior to booking, an examiner will discuss your circumstances and carry out a pre-assessment which includes discussion of your medical history and your general  well-being. Once your suitability is established a deposit is required of £200 to secure your booking, (deposits are non-refundable should you cancel). You will then receive you appointment confirmation along with our terms and conditions either by email or post, whatever your preference may be. Our terms and conditions can also be viewed on our website.

Please note: Confirmed appointments are necessary and we do not accept walk-ins. We are PCI DSS compliant and ICO registered.

Simply no. Everyone is at least a little nervous before taking a Polygraph Test, however the examiner conducting the test will assure the subject that they should not be concerned with being nervous. Nervousness is not interpreted as deception.