Polygraph Examinations & International Credibility Assessment

A polygraph examination can be effectively administered in multiple languages by using qualified interpreters. During the examination, the questions are asked directly in the subject's language.

To ensure the highest standard of service, we strongly advise contacting Dr Ashcroft directly to discuss your case and schedule an initial consultation. During this call, the specifics of your situation will be reviewed, and a mutually agreeable time, date, and location for the examination will be confirmed.

Following your inquiry, you will receive a detailed email outlining preparatory steps for the examinee, procedural recommendations, and required documentation.

Please note: We do not accept instructions from individuals or entities involved in, or associated with, criminal activity. We exclusively dedicate our services to upholding integrity within lawful and ethical frameworks.

An online booking service is a poor choice for clients enquiring about a polygraph examination because the process requires personalised consultation to address sensitive legal, ethical, and psychological concerns. Automated systems lack the ability to pre-screen clients for suitability, explain test limitations, or ensure confidentiality, key factors in polygraph testing.

Additionally, miscommunication risks arise if clients book the wrong type of exam without professional guidance, potentially leading to invalid results or legal issues. A direct conversation with an examiner is essential to assess individual needs, provide accurate information, and maintain privacy.

Warnings: Be wary of companies who do not specify the names of the examiners, and offer domestic appointments.

Certain physical, psychological, or medical conditions can make an individual unsuitable for a polygraph examination:

It is vitally important to stress that all examinations must be taken on a voluntary basis. No person should be intimidated or coerced into taking such an examination. If you have been threatened to participate in a polygraph interview and examination, this could have a negative influence over the whole testing process. As a strict policy we do not accept instructions where we believe coercion or threats are present.

A significant point of scepticism is that the high accuracy rates (86-90%) are primarily based on limited or company-funded studies. Independent, large-scale, peer-reviewed research is sparse.

We should never use this type of technology in isolation; instead, it should be used in conjunction with a traditional polygraph procedure. Ocular-motor measures of deception are susceptible to substance countermeasures.

EyeDetect's classification system suffers from significant transparency issues, operating as a proprietary "black box" algorithm.

Warning: While P300-based EEG testing is a promising technology for detecting recognition of specific information, it is not a replacement for a polygraph examination.

• Limited Scope: A P300 test is designed for one specific purpose - to detect if a person possesses concealed knowledge.
• Susceptibility to Countermeasures: Research has shown that P300 tests can be vulnerable to mental countermeasures.
• Lack of Field Validation: Its reliability in real-world investigations is still under debate.
• False Positives: A "positive" result only indicates the brain recognised the information.

Recommendation: This technology should be viewed as a specialised investigative tool, not a comprehensive lie detector.

Fees vary on the type of exam and where it will be conducted. Our fees reflect the extensive training, continuing professional development, and specialised instrumentation required. Our examiners are also qualified as Expert Witnesses.

We offer a highly flexible and mobile service with appointments on most days, nights and at weekends. We do require full payment for services at the point you agree to your appointment. Once an appointment is made, fees are non-refundable.

Various U.S. Government research studies have found that single-issue credibility assessments, conducted by an appropriately qualified examiner, are 87 to 95 percent accurate. It is undeniably the most accurate method for determining truth or deception. The accuracy of multi-question formats is approximately 80 percent due to memory related factors.

Usually we can arrange a suitable neutral testing environment in your particular location. For therapeutic services, our consultants use clinic settings. In accordance with APA recommendations, we do not do domestic (home) testing as it is rarely possible to control the environment to a satisfactory degree.

Failing a polygraph: It is vitally important to stress that before any life-changing decisions are made on the basis of a 'failed' polygraph examination there must be other corroborating evidence.

The whole process takes around two hours or more to complete. It involves a full interview to determine a statement of the facts, as well as the use of the polygraph instrument to collect data.

Single-Issue and Specific-Issue Polygraph Examinations have proven the most accurate. In formal, valid credibility assessment, only one issue is addressed within the examination to ensure accuracy.

Furthermore, the answer to each question is limited to 'yes' or 'no'. You cannot mix issues within the same polygraph interview.

Examinees will be sent information on how to prepare for the test:

• Be free of any serious illness
• Should not have been subjected to any accusatory interviews prior to the examination
• Must not be under the influence of alcohol or substances of abuse
• Must have had a reasonable amount of sleep
• Must be sufficiently hydrated and had something to eat
• At least one finger must be nail varnish free
• COVID-19: Please inform the examiner prior if you have symptoms

• The test results relate to what the examinee perceives
• Not everyone is suitable for testing due to physiological and psychological differences
• The clarity of issues being tested
• Number of issues being tested

Please note that our examiners do not re-examine the work of other polygraph examiners as a matter of company policy and professional ethics unless there is a clear violation of the American Polygraph Association standards of practice.

In most cases the results are given during the examination process, or soon thereafter if a peer review is necessary. Our examiners will at all times ensure complete confidentiality and discretion.

The examinee must provide government identification (Photo ID Card, Passport, Driving License) on arrival for verification purposes.

Given the ubiquity of television programmes showing so-called 'Lie Detector Tests', it is expected that the polygraph examiner can ask multiple questions on various issues; this is simply not possible in scientific terms. In formal, valid credibility assessment, only one issue is addressed within the examination to ensure accuracy. You cannot mix issues within the same polygraph interview and examination.

How the polygraph instrument identifies the particular arousal pattern does not rely on fight, freeze or flight. These notions are outdated and irrelevant to modern polygraph science.

Current understanding refers to what is known as the 'orienting response' to novel or important stimuli, which are intrinsically related to experiences in autobiographical memory, emotional salience and the act of lying requiring increased cognitive processing.

Specifically, it takes more cognitive activity to lie than to tell the truth because you need to construct a narrative. Thus, essentially, we are analyzing the strength of attention as determined by autonomic arousal.

Our fees depend on the complexity of the investigation and the disbursements for travel and serviced offices. Fees range from £350 to £1500 or more. We provide custom quotes based on case complexity, location, and examiner expertise.

Only the examiner and the examinee can be present when the actual polygraph interview and examination takes place. As recommended by the American Polygraph Association, which ensures the whole process can be conducted in a controlled environment.

All of our polygraph instruments have the latest Movement Monitoring Systems, with multiple channels to ensure that any countermeasures will be easily detected.