Pneumograph
Breathing
Two tubes rest across the chest and abdomen and record the depth and rhythm of each breath. People hold their breath without noticing; the chart notices.
Reading room
What we know, written down
Straight explanations of how a polygraph examination works, what it can and cannot establish, and how to tell a real one from the things being sold as lie detection. Written by the people who run the tests. Written by the Lie Detector UK examiners, on what a polygraph can and cannot tell you.
Subject
Polygraph Examiner
10 articles
Polygraph Examiner
The British Polygraph Society: What It Is, What It Can Do, and What It Cannot
In short The British Polygraph Society is a voluntary professional body for polygraph examiners in the UK. It was constituted by its…
Polygraph Examiner
Polygraph Examinations on Licence: What the HMPPS Policy Framework Actually Says
In short HM Prison and Probation Service polygraphs people released on licence after a conviction for a serious sexual offence or a…
Polygraph Examiner
Can You Fail a Polygraph While Telling the Truth?
Yes — 95 to 98% accuracy means it is not 100%. But the usual causes are not the ones people fear: nervousness…
Polygraph Examiner
What Actually Happens in the Two Hours of a Polygraph Examination
About two hours, and the part with the instrument attached is the shortest of them. What happens from arriving to the written…
Polygraph Examiner
ADHD, Autism and Neurodivergence in a Polygraph Examination
ADHD and autism do not disqualify you, and the criteria people panic about describe acute unmanaged states rather than a diagnosis. What…
Polygraph Examiner
How to Become a Polygraph Examiner in the UK
There is no licence to practise and no legal barrier to calling yourself an examiner, which is why the professional route matters.…
Polygraph Examiner
Can You Beat a Polygraph? Countermeasures, and What Actually Happens
Every method for beating a polygraph is decades old and examiners are trained to spot them. The usual result is not a…
Polygraph Examiner
Fake Lie Detector Tests Reports
Deconstructing the Implications of Forged Polygraph Test Reports Polygraph tests or ‘lie detector tests’ are long-standing tools for discerning truthfulness in a…
Polygraph Examiner
What Medical Conditions Affect a Polygraph?
Medical conditions like anxiety, hypertension, and asthma can affect polygraph results, leading to false positives or negatives. Always disclose health issues before…
Polygraph Examiner
The True Cost of Polygraph Machines in the UK: A Detailed Guide
Explore the costs and benefits of polygraph machines in the UK. Learn about pricing, training, and operational expenses for effective lie detection…
Subject
Infidelity
6 articles
Infidelity
Couples Lie Detector Tests: When They Help, and When They Make It Worse
Two separate examinations, both voluntary. The best predictor of whether it helps is whether both people have decided in advance what they…
Infidelity
Affairs at Work: The Signs, and What They Are Actually Worth
Workplace affairs are the hardest to resolve informally, because work supplies an innocent explanation for everything. Why watching for signs produces certainty…
Infidelity
Polygraph Questions Examples for Infidelity and Sexual Contact Examinations
Understanding the Limits and Scope of Lie Detector Test Questions Clients often ask us during the free consultation whether their proposed questions…
Infidelity
Infidelity Statistics in the UK (2025)
Infidelity remains a significant issue in the UK, with around 1 in 5 adults admitting to cheating on a partner. Surveys show…
Infidelity
Is She Cheating Over Text? 15 Warning Signs to Watch For
Trust isn’t about checking phones, but when behaviors shift—like hiding screens or texting at odd hours—it raises concerns. If her habits have…
Infidelity
15 Telltale Physical Signs Your Wife May Have Recently Been Intimate with Someone Else
Infidelity shatters trust, yet early detection through physical signs can foster healing. Recent data from the General Social Survey shows 13% of…
Subject
Lying & Human Behavior
3 articles
Lying & Human Behavior
Detecting Deception in Text Messages: What Language Research Shows
Liars do use language differently — fewer first-person pronouns, more negative emotion, less detail. Every effect is small, measured across thousands of…
Lying & Human Behavior
Body Language and Lying: What the Research Actually Shows
Looking left, breaking eye contact, touching the nose, folding the arms — every classic tell has been tested, and none of them…
Lying & Human Behavior
150 Insightful Questions to Truly Get to Know Someone
Discover 150 thought-provoking questions designed to deepen connections, spark meaningful conversations, and build trust—perfect for friends, partners, and new acquaintances. Start connecting…
Subject
False Accusations
2 articles
False Accusations
False Accusations at Work: Your Rights, and What to Do First
Your employer must investigate reasonably before acting, and you have a statutory right to be accompanied. What to do in the first…
False Accusations
Signs of a False Accusations
False accusations can damage reputations, careers, and relationships. Learn the 10 key signs of false allegations and how a lie detector test…
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What is actually recorded
A polygraph is a recorder, not a lie meter.
Four channels run continuously for the whole examination. No single reading decides anything — the examiner scores the pattern across all of them, against your own baseline answers.
Cardiovascular
Pulse and blood pressure
A cuff on the upper arm tracks pulse rate and relative blood pressure through the examination, not just at the moment a question is asked.
Electrodermal
Skin conductance
Two fingerplates measure the sweat glands’ response, which shifts within seconds of a relevant question and is not something a person can consciously hold still.
Activity sensor
Movement and countermeasures
A pad in the seat records movement, including the small deliberate kind — pressing the toes into the floor, tensing a muscle, altering the breath on purpose. Attempts to influence a chart show up here as steps that belong to none of the other channels, which is exactly why the channel exists.
Each examination is limited to three relevant questions, agreed with you before the instrument is attached. You will not be asked anything you have not already seen.