Professional deception detection using P300 EEG brain-wave technology — 95% accuracy, same-day results, from £499. Serving Portsmouth and the wider West Yorkshire area.
Deception detection is the process of determining whether someone is being truthful — using science, not guesswork.
When someone lies, their body and brain respond in measurable ways. For over a century, polygraph machines tried to catch those responses by tracking heart rate, blood pressure, and sweating. The problem is those signals are triggered by stress and anxiety — not deception itself. A nervous truthful person fails. A calm liar passes.
Modern deception detection takes a fundamentally different approach. Instead of measuring stress, our P300 EEG system measures what your brain recognises. When your brain encounters information it already knows — a name, a place, a detail from an event — it produces an involuntary electrical spike. You cannot suppress it, fake it, or train it away. That's what makes P300 EEG deception detection 95% accurate, compared to roughly 65–70% for a traditional polygraph.
We provide professional deception detection across Portsmouth and the wider West Yorkshire area for relationships, family disputes, workplace accusations, corporate investigations, and legal matters. Testing is non-invasive, takes around 90 minutes, and starts from £499. We travel to you or you can visit one of our testing venues.
The P300 is a specific electrical signal your brain produces when it recognises something it already knows. Here's exactly how we use it.
Roughly 300 milliseconds after your brain sees a stimulus it recognises, it produces a measurable spike of electrical activity called the P300 event-related potential. This was first documented in peer-reviewed neuroscience research in the 1960s and has been studied extensively ever since. The P300 is completely involuntary — it happens before conscious thought. Your brain fires it whether you want it to or not.
You wear a lightweight BrainBit EEG headband that sits on your forehead and behind your ears — no wires, no straps, no chest sensors. You sit in front of a screen and are shown a series of words, images, or statements. Some are relevant to the case. Some are irrelevant controls. All you do is watch.
Our 8-channel EEG system records your brain's response to each stimulus in real time. When your brain recognises something relevant — a person's name, a location, a detail you claim not to know — the P300 spike appears across multiple channels. When the stimulus means nothing to you, the signal stays flat. That recognition vs no-recognition pattern is what determines the result.
Polygraph countermeasures work because they target voluntary body responses — you can control your breathing, clench your toes, or bite your tongue to disrupt readings. The P300 response is neurological and involuntary. There is no muscle to clench, no breathing pattern to change, and no mental technique that suppresses it. Published research by Farwell & Donchin (1991) and Rosenfeld et al. (2008) consistently shows detection rates between 90% and 98% in controlled blind testing.
Within the hour of testing, you receive a detailed 8-page forensic report covering the raw EEG data, P300 spike analysis for each question, deception scoring, and a clear truthful or deceptive determination. The report is suitable for solicitors, employers, HR departments, or personal use. Expert testimony is available on request.
Independent research consistently shows P300 EEG brain-wave analysis outperforms traditional polygraph across every key measure. Here's how the two methods compare for clients in Portsmouth.
Sources: Farwell & Donchin (1991), Rosenfeld et al. (2008), peer-reviewed EEG literature.
P300 EEG measures involuntary brain responses — impossible to fake, unlike physical stress signals measured by polygraph.
Polygraph results can be manipulated with breathing or muscle techniques. P300 brain-wave responses cannot be consciously controlled.
No chest straps, blood pressure cuffs or finger sensors. Just a lightweight headband — making results in Portsmouth more reliable and comfortable.
The P300 brain-wave spike is a single, unmistakable response. Polygraph produces four overlapping signals full of noise. See why P300 EEG results in Portsmouth are so much clearer to read and harder to dispute.
P300 EEG — Brain Wave Response
✓ One clear spike — unambiguous result
Polygraph — 4 Overlapping Signals
✗ Noisy, subjective, open to interpretation
Illustrative waveforms based on published EEG and polygraph signal characteristics.
A traditional polygraph straps sensors to your chest, fingers, and arm — measuring sweat, breathing, and blood pressure while you sit in stress. Our P300 EEG test uses a single lightweight headband that reads brain activity directly. No discomfort, no intimidation, and it's over in under 90 minutes.
Every P300 EEG test includes a detailed 8-page forensic report — covering raw brain-wave data, P300 spike analysis, and a clear truthful or deceptive determination. Delivered within the hour. Swipe through example pages below.
Granular breakdown of deception scores calculated from specific neural biomarkers.
Clear, definitive results indicating deception probability and overall risk assessment.
Signed certification of examination suitable for legal or private verification purposes.
Full transparency with access to the raw visual data used to generate the final conclusion.
Millisecond-by-millisecond timeline of brain activity in response to probe stimuli.
Comparative analysis of responses to relevant, irrelevant, and control questions.
Analysis of response latency indicating increased cognitive load during deceptive answers.
Scientific validation of P300 wave amplitude and latency specific to the subject.
We understand that visiting a testing centre is not right for everyone. That’s why we offer fully mobile P300 deception detection testing at your home, workplace or chosen safe location in Portsmouth and across West Yorkshire.
Our examiners can travel discreetly to your home in Portsmouth or elsewhere in West Yorkshire and set up the P300 EEG equipment in a quiet room. This is ideal for relationship issues, family disputes and highly sensitive personal matters.
If home or office is not suitable, we can arrange a neutral “safe place” such as a private meeting room or hotel suite in Portsmouth or elsewhere in West Yorkshire. This keeps all parties comfortable and protected.
For businesses, we bring the deception detection system directly to your Portsmouth or West Yorkshire office or warehouse, minimising disruption while providing clear, objective findings.
Protect your Portsmouth and wider West Yorkshire business interests with professional P300 EEG deception detection. Advanced screening for employees, fraud investigation, and corporate security.
Comprehensive deception detection services for Portsmouth and West Yorkshire businesses. Our P300 EEG technology provides reliable screening and investigation services to protect your company from fraud, theft, and misconduct across the region.
Volume testing from £399/person • Annual contracts available • On-site testing in Portsmouth and across West Yorkshire
Confidential lie detector testing for personal matters in Portsmouth and across West Yorkshire. Relationship issues, family disputes, and private investigations with complete discretion.
Private deception detection services for Portsmouth residents and the wider West Yorkshire community seeking truth in personal matters. Our sensitive approach and advanced P300 EEG technology provide clarity in difficult situations.
Individual tests from £499 • Couples testing £799 • Payment plans available for Portsmouth and West Yorkshire residents
Our P300 deception detection tests support individuals, couples, families, businesses and legal professionals across Portsmouth and the wider West Yorkshire region.
Many people in Portsmouth and throughout West Yorkshire come to us when they need to clear their name or confirm the truth in difficult family situations. Our approach is calm, respectful and completely confidential.
Portsmouth and West Yorkshire companies, HR teams, solicitors and investigators use our deception detection tests as part of broader decision-making and evidence gathering.
Our mobile P300 EEG units cover all of Portsmouth and beyond, serving the entire region.
When you search for deception detection or lie detector tests in Portsmouth or across West Yorkshire, you need a provider you can genuinely trust.
Tell us your situation in plain English. Our AI will generate 3 professionally worded yes/no questions — ready to use in your P300 EEG test in Portsmouth.
Here are your 3 suggested P300 test questions for Portsmouth:
These questions are ready to use. Book your test in Portsmouth and we'll confirm and finalise them with you before the session.
Book My Test in Portsmouth →Your situation is not stored or logged. This tool uses AI to suggest questions only — final questions are always confirmed with your examiner before testing.
Watch how our brain-wave technology reveals the truth about infidelity with 95% accuracy
💔 Ready to discover the truth? Call 0161 524 5513 or book confidential consultation →
A snapshot of how individuals, families and organisations in Portsmouth and across West Yorkshire describe their experience with our deception detection service. Scroll sideways to browse more reviews.
“The P300 EEG screening helped us resolve an internal fraud case in
under a week. The test process was clear, discreet and the report
was strong enough for our legal team to act on.”
— James H., Business Owner (Portsmouth)
“After months of doubt, the P300 test finally gave us clarity.
The examiner in Portsmouth was calm, non‑judgemental and explained
every step so we knew exactly what the results meant.”
— Sarah M., Private Client (Portsmouth)
“We now use Lie detector test for senior hiring and sensitive roles.
It’s become a core part of our risk management, giving us far more
confidence than traditional vetting alone.”
— Mark T., HR Director (West Yorkshire)
“The team brought the equipment to our office in Portsmouth,
set everything up quickly and kept disruption to a minimum.
Professional from start to finish with clear, factual outcomes.”
— Corporate Client (West Yorkshire)
“Lie detector test gave our family neutral evidence we could all accept.
It didn’t solve every disagreement overnight, but it removed the
doubt around what actually happened.”
— Family Client (West Yorkshire)
"Deception Detection resolved a stock theft case in our warehouse that had been going on for months. The lie detector test was thorough and the written report gave us everything we needed to act."
— Operations Manager (Portsmouth)
"I had been suspicious for over a year. The lie detector test at Deception Detection gave me the answer I needed in under 30 minutes. The examiner was calm and the report was clear and professional."
— Private Client (Portsmouth)
"I was wrongly accused at work and had no way to prove my innocence. Deception Detection's lie detector test gave me a documented result my employer accepted. My position was reinstated the same week."
— Employee Client (West Yorkshire)
"Deception Detection handled a sensitive director-level investigation with complete discretion. The P300 lie detector test report was detailed enough for our board to make a confident decision."
— Company Secretary (Portsmouth)
"We had reached a point where we couldn't move forward without independent evidence. The lie detector test from Deception Detection gave us a factual baseline that our counsellor used in our next session."
— Couple (West Yorkshire)
"I needed a same-day lie detector test and Deception Detection had an examiner available within hours. The result was ready before I left the session. Incredibly fast and professional service."
— Private Client (Portsmouth)
"My solicitor recommended Deception Detection for a civil dispute. The lie detector test report was formatted to legal standards and gave our team supporting evidence that changed the direction of the case."
— Litigation Client (West Yorkshire)
"We commissioned Deception Detection to verify witness accounts in a high-value insurance claim. The P300 lie detector test results were specific, objective and gave our team the confidence to challenge the claim."
— Claims Investigator (Portsmouth)
"Cash had been disappearing from our home for months. Deception Detection's lie detector test identified who had specific knowledge of the incidents. The situation was resolved without involving the police."
— Family Client (West Yorkshire)
"Our IT team had been trying to identify a data leak for weeks. One lie detector test session with Deception Detection narrowed the field immediately. Digital forensics confirmed the result within days."
— Head of Security (Portsmouth)
"The Deception Detection team handled a safeguarding case with exceptional sensitivity. The lie detector test gave our team documented findings that supported a formal referral we could not have made on verbal accounts alone."
— Safeguarding Lead (West Yorkshire)
"Stock had been walking out of our three locations for months. Deception Detection ran lie detector tests across the front-of-house team and the shortfalls stopped the same week results were delivered."
— Retail Manager (Portsmouth)
"Before committing to marriage I needed to know the truth about my partner's past. Deception Detection handled the lie detector test with complete professionalism and the results gave me the clarity I needed to move forward."
— Private Client (West Yorkshire)
"Deception Detection provided a P300 lie detector test for a sensitive staff conduct matter. The report gave our HR panel independent scientific findings alongside the documentary evidence we already held."
— NHS Trust HR Manager (Portsmouth)
"Our family had been divided for two years over whether our mother's will reflected her genuine wishes. Deception Detection's lie detector test gave our solicitor objective supporting evidence to work with."
— Siblings (West Yorkshire)
"My partner agreed to a lie detector test with Deception Detection after months of broken trust. The result was definitive and the examiner in Portsmouth handled what was an emotional situation with real care."
— Private Client (Portsmouth)
"Materials had been disappearing from site for three months. Deception Detection's lie detector test identified who had knowledge of how the thefts were being carried out. Losses stopped immediately."
— Site Director (West Yorkshire)
"Having Deception Detection's lie detector test report on the table completely changed the tone of our mediation. Both parties accepted the findings and we reached a settlement the same day."
— Mediation Solicitor (Portsmouth)
"We suspected a family member had been taking money from our elderly father's account. Deception Detection's lie detector test confirmed who had knowledge of the specific transactions. We were then able to act."
— Family (West Yorkshire)
"I was suspended from my teaching post over a false allegation. The lie detector test from Deception Detection gave my union a documented independent result that changed the outcome of the disciplinary hearing."
— Teacher Client (Portsmouth)
"Our hospitality business had been losing cash from the bar every weekend. Deception Detection ran a lie detector test across the front-of-house team and the shortfalls stopped the same week."
— Bar Owner (West Yorkshire)
"I run a PI agency and refer clients to Deception Detection regularly. Their lie detector test reports are consistently professional, well-formatted and delivered on time. The P300 methodology adds credibility no surveillance footage can match."
— Licensed PI (Portsmouth)
"We used Deception Detection as part of due diligence before appointing a new financial controller. The lie detector test gave our board a documented layer of assurance no other element of recruitment could provide."
— SME Board Chair (West Yorkshire)
"Deception Detection helped me build a case against a stalker. The lie detector test report provided court-admissible evidence that was crucial in securing my restraining order. The team were supportive throughout."
— Personal Safety Client (Portsmouth)
"I was based abroad and Deception Detection arranged a remote lie detector test session seamlessly. The report quality was identical to an in-person session. I would not hesitate to use them again."
— International Client (West Yorkshire)
"Two members of staff had made conflicting allegations. Deception Detection's lie detector test gave our governing body independent findings neither party could dispute. The matter was resolved confidentially."
— Head Teacher (Portsmouth)
"A driver was suspected of falsifying delivery records and diverting loads. Deception Detection's lie detector test confirmed deceptive responses around the specific routes and dates in question. The matter was closed within the week."
— Fleet Director (West Yorkshire)
"A former employee made damaging public accusations about our business. The Deception Detection lie detector test documented our side of events clearly. Our legal team used it as supporting evidence in defamation proceedings."
— Business Owner (Portsmouth)
"Our charity suffered internal theft and needed a discreet resolution. Deception Detection identified the source through their lie detector test quickly and the matter was resolved without any public exposure."
— Charity CEO (West Yorkshire)
"We used Deception Detection as part of a risk assessment for a senior appointment in a regulated industry. The lie detector test gave our compliance team documented assurance at the highest possible level."
— Compliance Director (Portsmouth)
"I refer clients to Deception Detection when financial evidence alone is inconclusive. The lie detector test report format is rigorous and sits alongside financial documentation in formal dispute processes without issue."
— Forensic Accountant (West Yorkshire)
"One partner was suspected of concealing assets during our business split. Deception Detection's lie detector test gave our legal team a documented starting point that changed the entire negotiation dynamic."
— Commercial Solicitor (Portsmouth)
"A pharmacist in our practice was suspected of falsifying dispensing records. Deception Detection's lie detector test confirmed deceptive responses around specific entries. We were able to act and protect our patients."
— Practice Principal (West Yorkshire)
"We used Deception Detection as an extra layer of assurance during a merger. The lie detector test helped confirm the integrity of key executives from the acquired company and reduced risk significantly."
— M&A Director (Portsmouth)
"We commissioned Deception Detection for a sensitive staff matter at our practice. The lie detector test was handled with complete discretion and the report gave our partners the independent evidence they needed."
— GP Practice Manager (West Yorkshire)
"A family member had been letting our holiday cottage privately and keeping the income. Deception Detection's lie detector test confirmed who had knowledge of the bookings. The arrangement was ended and accounts were settled."
— Property Owner (Portsmouth)
"The Deception Detection lie detector test report was clear enough that a non-technical tribunal panel could follow the conclusions without specialist guidance. Far more useful than I anticipated."
— Employment Tribunal Adviser (West Yorkshire)
"We suspected a relative visiting our mother's care home had been taking items. Deception Detection's lie detector test confirmed who had knowledge of those incidents. The visits were then supervised."
— Family (Portsmouth)
"Our firm now offers Deception Detection's lie detector test as an optional step for senior executive placements. Candidates who complete it give clients a level of assurance references and interviews simply cannot match."
— Executive Search MD (West Yorkshire)
"Deception Detection's lie detector test gave our investigation committee independent scientific findings alongside the documentary evidence we already held. It was the missing piece that allowed us to reach a clear conclusion."
— Audit Committee Chair (Portsmouth)
"The child-focused lie detector test protocol at Deception Detection was handled with exceptional care. The team were gentle, patient and clearly experienced with vulnerable clients. The outcome guided our safeguarding decision."
— Local Authority (West Yorkshire)
"Money had gone missing from a family safe during a period of bereavement. Deception Detection's lie detector test identified who genuinely recognised the specific details of what had been taken. It ended years of suspicion."
— Family (Portsmouth)
"A family member managing our aunt's affairs had transferred property into their own name. Deception Detection's lie detector test helped establish what our aunt had genuinely understood. It gave our legal team important supporting evidence."
— Family (West Yorkshire)
"We needed to verify the account of a key witness in a high-value commercial dispute. Deception Detection's lie detector test gave our litigation team independent supporting evidence that strengthened our position going into settlement."
— Senior Litigation Partner (Portsmouth)
"I contacted Deception Detection on Monday morning with an urgent corporate requirement. The lie detector test was completed and the report delivered by Wednesday. Outstanding turnaround that made a real difference to our timeline."
— Operations Manager (West Yorkshire)
"I was wrongly identified as the source of a workplace data breach. Deception Detection's lie detector test cleared me completely and the investigation was redirected to the actual source within days of the report being issued."
— IT Professional (Portsmouth)
"Our family had argued for two years about whether our mother had been pressured into moving into care. Deception Detection's lie detector test helped establish what she had genuinely understood at the time. It closed a damaging chapter."
— Siblings (West Yorkshire)
"My solicitor referred me to Deception Detection during a contentious divorce. The lie detector test report provided documented evidence around specific financial matters that my legal team used very effectively in proceedings."
— Private Client (Portsmouth)
"As a clinical psychologist I was impressed by the rigour of the Deception Detection protocol. The integration of neuroscience and careful questioning makes the lie detector test a powerful tool when used ethically and professionally."
— Clinical Psychologist (West Yorkshire)
"A sibling had been managing our parents' rental income and amounts were consistently short. Deception Detection's lie detector test confirmed who had genuine knowledge of the missing funds. We restructured the arrangement immediately."
— Siblings (Portsmouth)
Swipe or use the arrows to view more client reviews.
Professional deception detection services in Portsmouth start from £499 for standard P300 EEG testing. Same-day emergency service is available for £599. We offer corporate packages and volume discounts for multiple tests across West Yorkshire.
DeceptionDetection provides professional P300 EEG lie detector testing throughout Portsmouth and surrounding West Yorkshire areas. We have testing facilities in central Portsmouth and offer mobile testing services across West Yorkshire for your convenience.
P300 EEG deception detection achieves 95% accuracy by measuring involuntary brain responses. Unlike traditional polygraph tests, P300 brain-wave analysis cannot be manipulated or controlled, making it the most reliable deception detection method available in Portsmouth and across West Yorkshire.
A complete P300 EEG deception detection session in Portsmouth typically takes 45-90 minutes including setup, testing, and initial results analysis. This is significantly faster than traditional polygraph methods while providing superior accuracy for clients across West Yorkshire.
Yes, we offer same-day emergency deception detection services in Portsmouth for urgent cases across West Yorkshire. Contact us at 0161 524 5513 for immediate availability. Same-day service is £599.
Absolutely. All deception detection services in Portsmouth and throughout West Yorkshire are 100% confidential. We comply with GDPR regulations and maintain the strictest privacy standards. Your results are never shared without explicit consent.
Our P300 EEG technology in Portsmouth can detect all forms of deception including lies about past events, hidden knowledge, infidelity, theft, fraud, and misconduct. The brain's P300 response cannot be controlled, ensuring accurate detection for West Yorkshire clients.
Yes, we provide mobile P300 EEG deception detection services throughout Portsmouth and the wider West Yorkshire area. Our certified examiners can conduct testing at your home, office, or preferred location with portable professional equipment.
Yes, many Portsmouth and West Yorkshire couples use our deception detection services to resolve trust issues, verify fidelity, and rebuild relationships. We provide sensitive, professional testing with counselling support available where needed.
Documented cases from corporate theft to relationship disputes — what was found, who was cleared, and what the evidence enabled.
An employee suspected of stealing source code. Polygraph returned inconclusive at 52%. P300 EEG detected deception at 94% — even after attempted countermeasures.
Read the case study
£23,000 missing from a warehouse. Three staff under suspicion. All tested in a single day — two received written exoneration, one deception-indicated.
Read the case studyThree audits. Eight staff. Nine months with no resolution. All eight tested in one day — two deception-indicated, six cleared. £31,500 recovered.
Read the case study
Tenant denied liability for flood damage. No witnesses, no CCTV. P300 EEG deception-indicated on all three probe sets. Civil recovery issued.
Read the case studyGuides, research and expert advice from our P300 EEG testing practice.
The complete guide to approaching P300 EEG testing when infidelity is suspected.
ResearchPeer-reviewed accuracy data and why the science has moved on from polygraph.
ResearchCountermeasures, coaching, and why the P300 brain response is involuntary.
Mental Health4x increased depression risk. The research on what false accusations do.
GuideFrom arrival to results. Exactly what to expect during your appointment.
LegalWhere P300 EEG evidence stands in UK courts, tribunals and civil proceedings.
Professional P300 EEG lie detector testing and deception detection services across Portsmouth and the wider West Yorkshire region. Advanced brain-wave technology with 95% accuracy. Same-day appointments available from £499.
Lie Detector Test Portsmouth — P300 EEG results you can act on.