Cost is one of the first questions people ask when considering a lie detector test or polygraph examination. While price matters, the more important question is what the fee includes — and whether the examination is suitable, ethical, properly scoped and professionally conducted.
At the Centre for Forensic Neuroscience, fees are assessed on a case-by-case basis. This is because the cost of a polygraph examination can depend on the issue to be investigated, the complexity of the question formulation, venue and travel requirements, preparation time, reporting needs, and whether the instruction is private, legal, workplace or therapeutic in nature. A confidential discussion is recommended before any appointment is confirmed so that suitability, scope and likely cost can be explained clearly.
Why There Is No Single Standard Cost for a Polygraph Examination
Polygraph examinations vary because cases vary. A straightforward private single-issue matter is different from a solicitor-led instruction, a workplace investigation, a therapeutic disclosure examination, or a complex allegation matter. The fee must reflect the actual work involved.
Factors that can affect the cost include:
- The nature and complexity of the issue
- The number and type of questions to be examined
- Whether a suitability assessment is required
- The preparation needed before the appointment
- The location and venue arrangements
- Travel time and distance
- Whether a written report is needed
- Urgency or scheduling requirements
- Whether the instruction is private, legal, therapeutic or workplace-related
What Should Be Included in a Professional Polygraph Fee?
A professional polygraph fee may reflect the following work:
- A confidential initial discussion to understand the issue
- Suitability screening to determine whether a polygraph is appropriate
- Review and clarification of the matter to be examined
- Question formulation — developing clear, testable questions
- Preparation time before the appointment
- A structured pre-test interview
- The informed consent process
- The polygraph examination itself
- Analysis and interpretation of results
- A verbal explanation of the outcome
- A written report where appropriate
- Administrative time
- Travel and venue arrangements where relevant
Not every case requires the same level of preparation or reporting. A private relationship matter may require a different scope from a solicitor-led instruction or a workplace investigation. The fee should be proportionate to the work involved.
Why the Cheapest Lie Detector Test May Not Be the Best Value
Very low prices may raise questions about the quality and thoroughness of the examination. Clients should consider:
- How much time is spent assessing suitability before booking
- The examiner’s training and experience
- The quality and care of question formulation
- Whether a written report is included
- Whether venue and travel costs are included
- Whether the appointment is rushed
- Whether ethical issues are properly considered
- Whether the examiner is named and accountable
A lower price is not automatically a problem, but clients should understand exactly what is included and whether the examination is being conducted to a professional standard.
For guidance on what to look for in a professional examiner, see our article on how to choose a polygraph examiner in the UK.
Why Some Polygraph Examinations Cost More
A higher fee may be justified where the case involves:
- A legal instruction requiring solicitor correspondence
- A workplace or employment context with HR documentation
- Multiple documents or background material to consider
- Therapeutic disclosure preparation and coordination
- Safeguarding complexity
- Detailed written reporting
- Travel to a suitable venue
- Urgent scheduling
- Additional professional time before or after the examination
Private Relationship and Infidelity Polygraph Costs
Private relationship matters are often specific-issue examinations, but the scope still matters. The issue must be clearly defined, questions must be specific and behaviourally focused, and both parties should have clarity about what the examination can and cannot answer.
Coercion or pressure must be avoided — all polygraph examinations must be taken on a voluntary basis. Not every relationship dispute is suitable for polygraph testing. A professional examiner should be willing to explain the limitations and decline cases where a polygraph is unlikely to be helpful or appropriate.
For more information on relationship and infidelity polygraph examinations, see our dedicated page.
False Allegation and Legal Context Costs
False allegation matters can require additional care, especially where there are legal proceedings, solicitor involvement, police involvement, safeguarding concerns or reputational risk. The question formulation, reporting and professional context may need to be handled differently from a private relationship matter.
A polygraph examination in this context should not be treated as proof of innocence or guilt. It may provide additional investigative information where the scope is appropriate and the examination is professionally conducted. Solicitors and barristers may instruct the Centre directly where the instruction is clear and suitable.
Workplace, Theft and Internal Investigation Costs
Workplace matters may involve employer and employee consent issues, workplace policies, HR context, documentation, internal investigation scope, report requirements and potential legal or employment implications.
The cost may be higher where there is substantial background to review or where reporting needs to meet a specific professional or legal standard. Employers should not use a polygraph as a substitute for fair investigation or legal and HR advice. For more on workplace polygraph examinations, see our dedicated page.
Therapeutic Disclosure or Behavioural Accountability Costs
Therapeutic disclosure-related polygraph work may involve additional scoping, careful question formulation, professional boundaries and coordination with the referring therapist or treatment provider. The examination may support a disclosure or behavioural accountability process, but it is not therapy and should not replace clinical or therapeutic support.
Costs in this context may reflect the additional preparation, the professional relationship with the referring clinician and the sensitive nature of the disclosure work. For guidance, see our page for therapists on disclosure statements and therapeutic polygraph.
Venue, Travel and Location Factors
The cost of a polygraph examination may depend on whether the examination is conducted at an appropriate professional venue, a meeting room, a solicitor’s office, or another suitable agreed location. Venue suitability matters because polygraph examinations require privacy, minimal interruption and appropriate conditions.
Examinations may be arranged at suitable professional venues in Manchester, Preston, London, Birmingham, Edinburgh or elsewhere in the UK, subject to availability and the nature of the instruction. In accordance with APA recommendations, examinations are not conducted in domestic settings.
Reporting: Is a Written Report Included?
Written reporting can affect cost because a proper report requires professional time and care. A report may include:
- The referral issue and agreed scope
- Examinee details where appropriate
- Questions presented during the examination
- Procedure followed
- Result terminology and interpretation
- Limitations and relevant caveats
- Examiner details and qualifications
Reporting requirements differ for private, legal, workplace and therapeutic matters. Whether a written report is included should be discussed and agreed before the appointment is confirmed.
Questions to Ask Before Comparing Prices
Before comparing polygraph examination prices, consider asking each provider:
- Who will conduct the examination?
- Is the examiner named?
- What is included in the fee?
- Is suitability assessed before booking?
- Are questions developed before the test?
- Will I see the questions before the examination?
- Is a written report included?
- Are venue and travel included?
- What happens if the case is unsuitable?
- What are the limits of confidentiality?
- How long will the appointment take?
- Are there any additional costs?
For a fuller guide, see our article on how to choose a polygraph examiner in the UK.
Cost Should Be Considered Alongside Suitability
The most important question is not whether someone can pay for a test, but whether the test is appropriate. A professional examiner should be willing to explain when a polygraph is unsuitable — and to decline a case where a polygraph would not be helpful, ethical or properly scoped.
A decision not to proceed can be a sign of professional integrity.
Learn more about how to prepare for a polygraph examination and what to expect from the process.
Why Dr Keith Ashcroft Assesses Fees Case by Case
Dr Keith Ashcroft, Principal Forensic Polygraph Examiner at the Centre for Forensic Neuroscience, assesses fees individually because the cost must reflect the nature of the instruction and the work required. This includes:
- The issue being examined
- Complexity of question formulation
- Venue and travel requirements
- Preparation required before the appointment
- Reporting requirements
- Legal, workplace, private or therapeutic context
- Suitability and ethical considerations
This case-by-case approach is intended to ensure that clients understand the scope, cost and limitations of the examination before deciding whether to proceed. To discuss your specific circumstances, contact Dr Keith Ashcroft for a confidential discussion.
Conclusion
The cost of a lie detector test in the UK is important, but it should be viewed in the context of professionalism, suitability, ethical practice, preparation, question formulation and reporting. A professional polygraph examination involves substantially more than a single appointment — it includes suitability screening, question design, informed consent, careful testing and appropriate interpretation of results.
Before choosing a provider based on price alone, take the time to understand what is included, whether the examination is suitable for your matter, and whether the examiner can demonstrate the training, experience and professional standards that a serious issue requires.
Frequently Asked Questions
How much does a lie detector test cost in the UK?
The cost can vary depending on the issue, complexity, venue, travel, preparation and reporting requirements. At the Centre for Forensic Neuroscience, fees are assessed on a case-by-case basis after a confidential discussion.
Why are polygraph examination fees assessed case by case?
Each matter is different. A private single-issue examination may require a different level of preparation and reporting from a solicitor-led, workplace, therapeutic disclosure or complex allegation matter.
Is the cheapest lie detector test the best option?
Not necessarily. Clients should consider examiner training, suitability screening, question formulation, ethical safeguards, reporting and what is actually included in the fee.
Does the cost include a written report?
That depends on the agreed scope. Some matters may require a written report, while others may not. Reporting requirements should be discussed before the appointment is confirmed.
Can I get an exact price before explaining the issue?
Usually, a clear fee can only be confirmed once the issue, scope, location, preparation and reporting requirements are understood. A brief confidential discussion is the first step.
Does a higher cost mean a better polygraph examination?
Not automatically. However, complex cases may cost more where additional preparation, travel, venue arrangements, professional time or reporting are required.
Can a solicitor request a polygraph examination?
Solicitor-led enquiries may be considered where the scope is clear and the examination is suitable. A polygraph should not replace legal advice or the court’s assessment of evidence. See our page on polygraph examinations for solicitors and barristers.
Important Disclaimer
This article is provided for general educational and consumer information only. It does not constitute legal advice, therapeutic advice, medical advice, or safeguarding advice. Polygraph results are investigative information and should not be treated as absolute proof of truth or deception. They do not replace legal advice, therapy, safeguarding procedures, workplace investigations or the court’s assessment of evidence. Fee information is general guidance only; an accurate quotation can only be provided after a confidential discussion about the specific matter. No solicitor-client or professional-client relationship is created by this publication.
Dr Keith Ashcroft is the Principal Forensic Polygraph Examiner at the Centre for Forensic Neuroscience. For professional enquiries concerning polygraph examinations and fees, contact Dr Keith Ashcroft.