Frequently Asked Questions.


How can I book a Polygraph/Lie Detector Test?

  • To make an enquiry or booking, you can either use our “Contact Us” form or call our head office directly. Should you choose our “Contact Us” form, we will respond to you usually on the same day.
  • If you choose to call our head office, one of our qualified examiners will be happy to assist you with your enquiry/booking. Please note all enquiries are strictly private and confidential.
  • To book an appointment we require a deposit (which is non-refundable).
  • Should you cancel your booking your deposit will not be refunded, however should you find that you need to reschedule your appointment, your deposit will not be lost but will be kept and deducted from the remaining balance of the test fee quoted.
  • Payment of the test can either be paid in full, or a deposit paid with the remaining balance payable prior to the date of the test, or on the day of the test.
  • We accept all major credit/debit cards, however we do not accept cheques.

What should I look for in a Polygraph Examiner?

A Polygraph Examiner should be professionally trained, and have graduated from an American Polygraph Association (APA) approved school. Qualified Examiners will hold memberships with and approved association such as The British Polygraph Assosciation (BPA) or The American Polygraph Association and will utilise the latest polygraph techniques, validated by the APA and should use the latest computerised Polygraph equipment, instrumentation and sensors. Qualified Examiners are also required by The APA to take continous 2 yearly updated training. Please ensure that upon selecting an Examiner, that they meet each and every one of these requirements. If in doubt fully qualified members can be found on The BPA or The APA website.


What is a Polygraph/Lie Detector Test?

The Polygraph Test, known popularly as "The Lie Detector" has been in use in the United States for over the last few decades. Polygraph tests have proven to be one of the most powerful, robust and useful scientific tools in criminal investigations and personnel screening. It is routinely used in almost all major investigations in advanced countries employing this forensic tool. In recent years, Polygraph tests have increasingly been used within the UK Government and Private Sector, for sex offender testing and monitoring, fraud, crime, infidelity, relationship issues and theft. Today, the polygraph test is used in more than 56 other countries world-wide, including Australia, Canada, China, Japan, Israel, Malaysia, Mexico, Philippines, Romania, Russia, Singapore, South Korea, Taiwan, South Africa, United Kingdom, Colombia, the Middle East etc.

The Polygraph works by recording a persons physiological changes during questioning, these changes which are recorded are picked up by sensors which are placed onto the examinees persons. The data which is recorded in the form of several charts can then be analysed by a qualified examiner and a decision rendered as to the examinees truthfulness or deception.


How accurate is the Polygraph/Lie Detector?

The American Polygraph Association (APA) has gathered over 200 studies on the subject of test accuracy, further details of these studies can be viewed on the APA website www.polygraph.org. Research results regarding polygraph testing vary depending on a number of factors some of which are laboratory studies, versus field studies and the inclusion or exclusion of inconclusive results.

To help achieve a high accuracy rate the examiner you use should be a properly qualified individual using a validated technique as set out by the APA. For qualified examiners please refer to The British Polygraph Association's website www.britishpolygraphassociation.org Although no forensic testing of any kind can be guaranteed to be 100% accurate, research has suggested that qualified polygraph examiners are up to 98% accurate in their overall decisions. (refer: Ansley N 1990 The Validity and reliability of Polygraph examinations in real cases).


Do nerves and anxiety effect the test results?

There is a universal fear or misconception that nerves and/or anxiety will effect the outcome of the test. Those who are deceptive tend to play on this as a get out clause and excuse when they fail the test, where as an innocent or truthful person will ask this question genuinely. Regardless of how nervous you are, you will be nervous throughout the testing process, which is expected. In short nerves are not considered when a decision is rendered and will therefore not effect the test result. The result given by the examiner is based on a persons physiological changes to each question asked and pertaining to that point in time. These physiological changes compared with nervous reactions are two different things entirely and can easily be distinguised by a qualified examiner.


What does a Polygraph/Lie Detector test consist of?

The polygraph test takes a minimum of 1.5hours but can take up to four hours depending on the issue being tested for. The test comprises of the following: The first section being the pre-test interview where a statement of consent to conduct the test is obtained. There is a explanation of the equipment being used, background data is gathered from the examinee. During this part of the test the examiner will fully discuss the questions being asked and will familiarise the examinee with the testing procedure. The second section is the data collection phase which includes attaching the components to the examinee, which includes upper body movement sensors attached to the chest. A standard blood pressure cuff is attached to the upper arm and is inflated, to record reading of the examinees heart rate and pulse rate. Electrodermal activity finger cuffs are attached to two fingers to measure skin conductance (sweat gland activity). The examinee sits on a movement sensor mat. Once complete the examiner will analyse the results and provide an opinion as to the truthfulness of the person taking the test depending on the test type. You will get the results the same day verbally via a phone call, followed up by a written report emailed or posted.


Where can a Polygraph test be conducted?

Lie Detector Investigations will travel to your location throughout the UK, to Ireland and on an International basis. Arrangements for travel, flights and conference rooms will be made by our Head Office on confirmation of your booking. Weekend appointments are available at our office however if we are required to travel to you, we would ask that you contact our head office directly, to check availability. Please note we require and request a warm and distraction free environment for tests conducted at your office. Some of the many locations Lie Detector Investigations conduct tests, are listed below. If you find your location is not listed below please do not hesitate to contact Lie Detector Investigations directly. Scotland: Aberdeen, Ayrshire, Dumfries & Galloway, Dundee, Edinburgh, Fife, Glasgow, Inverness, Lanarkshire, Perth & Kinross & Scottish Borders. Ireland: Belfast & Dublin. Wales: Bridgend, Caerphilly, Cardiff, Ceredigion, Conwy, Denbighshire, Flintshire, Gwynedd, Monmouthshire, Newport, Pembrokeshire, Powys, Swansea, Vale of Glamorgan & Wrexham. England: Barnsley, Blackburn, Bolton, Bradford, Calderdale, Cheshire, Coventry, Cumbria, Derbyshire, Doncaster, Durham, East Riding of Yorkshire, Kingston upon Hill, Kirklees, Lancashire, Leeds, Leicester, Lincolnshire, Liverpool, Manchester, Nottinghamshire, Northumberland, North Yorkshire, Oldham, Rochdale, Rotherham, Salford, Selby, Sheffield, Shropshire, Staffordshire, St Helens, Stockport, Wakefield, Warrington, Wigan, Wirral, York


How much does a Polygraph/Lie Detector Test Cost?

Depending on the nature of the test and your location, costs of a polygraph test can vary and therefore it is advisable that you contact our head office for a free no-obligation quotation.

  • Please note our test fees, (within the UK) include the cost of travel, meeting rooms/hubs, accommodation and a written report, (if a written report is requested).
  • Tests conducted out with the UK are subject to quotation, as appropriate arrangements need to made for travel, accommodation, meeting rooms and visas.
  • International appointments can usually be arranged and confirmed within 10 working days, although this can be sooner.

Is it possible to "beat" the test?

Due to the latest polygraph techniques and computerised equipment which are used, it is highly improbable. It is also very easy for a qualified examiner to pick up on any attempts to distort the polygraph tracings, or to alter the result of the test.


What languages can a Polygraph Test be run in?

Arrangements for an interpreter can be made however there are extra costs associated with this. We would ask you to contact our office directly to allow for the necessary arrangements to be made.

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