Frequently Asked Questions

A “Lie Detector Test” is the common term for a polygraph examination. The polygraph is the only scientifically validated instrument for detecting deception, which is why it is universally recognised as the true lie detector.

Within the field of psychophysiological detection of deception (PDD), the phrase has become a popular catch-all term. However, from a professional standpoint, the designation is only accurate when applied to a polygraph examination. Products such as voice stress analysers, ocular-based systems, or mobile applications deliberately brand themselves as “lie detectors” to gain market traction — this misrepresentation confuses the public and undermines legitimate polygraph science.

A Professional Lie Detector Test = Polygraph Examination. Nothing else.

Studies suggest that polygraph testing can achieve accuracy rates as high as 97%. The chosen technique depends on the nature of the inquiry, and each carries its own level of accuracy.

Despite these high accuracy rates, no test is entirely free from error. Human error can occur if an examiner fails to properly prepare the examinee, or through misinterpretation of physiological responses. To minimise such risks, examiners adhere to rigorous protocols and results are often reviewed by independent professionals to ensure impartiality and reliability.

Always check that the examination is conducted by a qualified polygraph examiner using a modern polygraph instrument. If it isn’t a polygraph test, it isn’t a real lie detector test.

Our examiners deliver an accuracy range of 95% to 98% by adhering to a rigorous operating framework built on four pillars:

• Highly experienced and skilled examiners — among the most capable professionals in the field
• State-of-the-art polygraph technology — advanced equipment with cutting-edge interfaces
• Controlled testing environment — carefully managed settings free from distractions
• Comprehensive pre-examination screening — thorough pre-screening safeguards the integrity of results

We exclusively use polygraph testing because it offers the highest levels of accuracy and reliability, measuring physiological responses like heart rate, blood pressure, and perspiration.

Voice stress testing analyses voice pattern changes but is not as reliable — the science is less established and more prone to inaccuracies. eyeDetect is a newer technology analysing eye behaviour, but we prefer the more established and widely validated method of polygraph testing.

The polygraph is the top lie detector in law enforcement and security. It accurately measures physiological reactions — heart rate, skin conductivity, respiration — to questions, helping experts identify truthful responses. Leading manufacturers include Lafayette Instrument Company and Stoelting Co.

Refusing a polygraph does not suggest guilt. Many subjects are simply nervous about an unfamiliar experience. Our examiners provision for nervousness and are trained to distinguish defensive behaviour related to the matter under investigation from general anxiety.

The polygraph measures changes in blood pressure, heart rate, respiration, sweat gland activity, and skin electrical response. These change when the brain and nervous system initiate the “fight-or-flight” response. The examiner determines if these changes indicate signs of deception.

First, a pre-test interview (approximately 45 minutes) where the examiner discusses the issue, gathers the exact goal of testing, and reviews photo identification. With your approval, other individuals may sit in on this interview.

Next, the examination itself — the examiner connects monitoring devices and asks a series of carefully formulated questions in a fair, objective format. Questions are repeated a minimum of 3 times for accuracy.

Finally, the examiner integrates all data and professional observations to determine a proper assessment. A fully verified report is peer-reviewed by a second examiner to confirm accuracy.

No. You may feel slight pressure from the blood pressure cuff on your arm, but it is no more uncomfortable than a routine blood pressure check. In fact, the cuff is slightly less inflated than in a medical situation, so discomfort should be minimal, if any at all.

No. If you are nervous at the beginning of the test, you will remain nervous throughout. Your reactions to answering truthfully and deceptively will still differ significantly, giving the examiner a clear indicator regardless of nervousness.

Definitely not! Not taking your prescription drugs could be dangerous and could actually interfere with the test. The vast majority of prescription drugs will not affect accuracy. In our pre-examination assessment we check for any medical conditions and advise accordingly.

With today’s technology, there are measures in place to detect any attempt to tamper with the test. You would not only be up against the equipment, but also highly experienced and trained examiners who are well aware that some will try to beat the test.

There is no strict minimum age. However, for accuracy, the subject needs a good level of language and understanding of the concept of truthfulness. Some children under 16 may not possess that comprehension, so this serves as a practical limit.

All questions must elicit “yes” or “no” answers. Key rules:

• No conjunctions (“and”, “or”) — they make questions ambiguous
• Short, concise questions produce better results
• Questions must be based on known facts, not opinions
• Each question covers one matter only
• Our examiners are specially trained in formulating questions correctly

For infidelity cases: questions about love (an opinion) or future behaviour are not permitted. For theft: typically 3–4 questions (e.g., “Did you steal X?”, “Do you know who stole X?”). For false accusations: statement verification is the most efficient method.

For accuracy, questions are repeated a minimum of 3 times during the test. No more than 3 questions can typically be asked. The examiner may add a fourth question at their sole discretion if further evidence may be acquired.

The examiner will thank you for your time. Results are not given immediately — the examiner takes your data for post-analysis and delivers results within 24–48 hours. Reports are always peer-reviewed by a second examiner.

The price of a single lie detector test ranges from $500 to $900 per exam, with a standard average cost of $700. This includes confirmation, pre-examination assessment, the polygraph test by qualified examiners, a fully verified report, and travel/venue expenses.

Beware of cheaper substandard tests with dubious results from individuals who do not produce peer-reviewed reports by professional, qualified polygraph examiners.

Consult our specific location listings for precise, fixed pricing details.

The cost for investigating infidelity typically ranges from $500 to $800. Variation depends on location, examiner expertise, case complexity, test duration, and any additional services required.

Consult our location listings for precise, fixed pricing in your area.

Use our secure online booking system. A non-refundable $100 booking fee is required to confirm your appointment. Upon completing your booking, you’ll receive confirmation via SMS and email with a simplified pre-examination assessment.

We typically arrange tests within 7 days of your online reservation. We serve clients throughout the United States with 140+ locations nationwide.

The $100 non-refundable booking fee is included in the total cost — no hidden charges. It secures the best-qualified examiners, supports vital pre-examination assessments, covers operational costs including scheduling and examiner coordination, and signifies a mutual commitment to the process. Once the pre-examination assessment is accepted, the full balance for your examination is required.

In most major U.S. cities, appointments are available within 3–7 days. For long-distance locations, the wait is typically 7–14 days. All testing centres are open Monday to Friday. We recommend booking early to secure your preferred time and location.

We offer 151+ professional testing locations across 23 states. All venues are private, climate-controlled office suites. The exact address is sent after booking.

A detailed test report is provided via email within 24 hours of the test, or 48 hours if sent via tracked mail. All reports are peer-reviewed by a second examiner before delivery.

Polygraph results can be used as supporting evidence in many legal proceedings. We provide detailed written reports and our examiners are available for expert testimony if required. If you need testing for legal purposes, we recommend discussing this with your attorney and our team beforehand.

Completely. Examinations take place in private, climate-controlled offices. Results are shared only with you — never disclosed to third parties without your explicit written authorisation. We do not use branded vehicles or visible advertising at our venues.

With your consent, we are willing to discuss findings with a third party to help find resolution and closure.

Choosing an examiner from a reputable organisation provides:

• Comprehensive training and expertise — rigorous certification and regular updates
• Consistency and reliability — standardised procedures across all examinations
• Access to advanced technology — state-of-the-art polygraph equipment
• Collaborative expertise — consultation with colleagues on complex cases
• Strict ethical standards — transparent, fair, and respectful processes
• Quality assurance — regular audits, reviews, and peer-reviewed reports