Relationship trust, false accusations & HR investigations — mobile service across Castle Douglas.
Unlike online gimmicks or voice stress analyzers, our service in Castle Douglas uses genuine medical-grade EEG equipment. We measure the P300 brainwave—a well-documented neurological response—to determine truthfulness with a level of accuracy that stands up to scrutiny in any professional lie detector test.
Last updated: 11 April 2026 · Castle Douglas · Dumfries and Galloway
We understand this can't always wait. That's why we offer same-day and next-day appointments across Castle Douglas and surrounding areas.
Call before noon and we can often attend Castle Douglas the same day. Same-day bookings are £599. Results the same evening.
Book today, tested tomorrow. Standard P300 lie detector tests in Castle Douglas from £499 with next-day availability 7 days a week.
A P300 test is a brainwave-based lie detection method that measures what your brain recognises — not how nervous you feel. It is fundamentally different from a traditional polygraph and significantly harder to beat.
When your brain encounters a piece of information it already knows — a name, a place, a detail from an event — it fires a specific electrical signal called the P300 wave, roughly 300 milliseconds after seeing or hearing that information. This response is generated deep in the cortex and is completely involuntary. You cannot choose to suppress it, in the same way you cannot choose to stop your pupils reacting to light. If the brain holds the knowledge, it fires. Every time.
We place a lightweight 8-channel BrainBit EEG headset on the person's scalp — no needles, no gel, no discomfort. During the test, we present a carefully designed sequence mixing three types of items: target items the person is told to watch for, irrelevant items that have no connection to the case, and probe items — details that only someone with guilty knowledge would recognise. The EEG records the brain's electrical response to every single item in real time at millisecond precision.
If the person genuinely does not know the case-relevant details, their brain treats the probe items exactly the same as the irrelevant ones — no recognition, no P300 spike. But if they do hold that knowledge and are concealing it, the brain fires a strong P300 response to the probe items, regardless of what the person says out loud. The difference between these two patterns is measurable, repeatable, and forms the basis of the result. Published research puts the accuracy of this method at approximately 90–95%.
A polygraph measures secondary stress responses — heart rate, blood pressure, sweat, breathing — all of which spike when someone is anxious, regardless of whether they are lying. This means innocent but nervous people can fail, and calm liars can pass. The P300 test sidesteps this entirely because it does not measure stress at all. It measures memory recognition — a cognitive process that anxiety, medication, breathing techniques and deliberate countermeasures cannot influence. That is why research consistently shows P300 EEG outperforming the polygraph by a wide margin.
Want the full science? Read our detailed P300 EEG explained page or see real case study outcomes.
We come to you. Choose the location that suits you best — fully discreet.
We can set up in any quiet room. Our equipment is compact, professional and discreet. No neighbours will know why we're there.
We regularly meet clients at Premier Inn, Holiday Inn and ibis hotels near Castle Douglas. A meeting room or standard room works perfectly. We can assist you with booking if needed.
For corporate clients in Castle Douglas, we can attend your office or a serviced meeting room on a local business park. Fully professional, fully private.
Based in the North West, we cover the entire United Kingdom. From Castle Douglas to London, Scotland, Wales and everywhere in between — travel fees apply outside the region.
Call 0161 524 5513 or book online. We confirm your Castle Douglas appointment within 1 hour. Choose your home, a local hotel, or our nearest testing facility.
Our examiner arrives at your Castle Douglas location with the portable 8-channel EEG system. The BrainBit headband is lightweight — no wires, no discomfort. We explain every step before starting.
We measure your normal brain activity to establish a personal baseline. This ensures 95% accuracy specific to your individual neural patterns.
You view a series of images and words on screen. Your brain involuntarily produces a P300 response when it recognises relevant information — this cannot be faked or controlled.
Results are explained immediately in plain English. You receive a your lie detector test results in PDF certificate within 2 hours, suitable for family discussions, or personal peace of mind.
SAME-DAY / NEXT-DAY
£599
Call before noon, tested the same day.
4+ DAYS NOTICE
£499
Same test, same report. Book ahead and save.
Both include mobile service, full report and results the same day. No hidden fees.
This is why Castle Douglas clients choose P300 brainwave testing over a traditional polygraph. One produces a clean, unmistakable scientific signal. The other produces noise.
Clean spike at 300ms — recognition confirmed. Involuntary. Cannot be faked.
✓ One clear, measurable response. Scientific. Objective. 90–95% accurate.
Chaotic stress signals — sweat, heart rate, breathing. Anxiety looks identical to deception.
✗ Noisy, subjective, ~60% accurate. Innocent people fail. Guilty people pass.
The P300 spike is a neurological fact — not an interpretation. When the brain recognises information it shouldn't know, it fires. Every time. No amount of nerves, medication or counter-measure training can stop it. That is why clients in Castle Douglas are choosing P300 EEG over the polygraph.
Peer-reviewed research accuracy rates for each method. The difference is not subtle.
Accuracy figures based on published peer-reviewed research. P300 EEG data sourced from Farwell & Donchin (1991), Rosenfeld et al., and subsequent independent replication studies.
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.
People book lie detector tests in Castle Douglas for many reasons. Our role is not to judge, but to provide clear, objective data so you can make informed decisions.
If trust has broken down, a P300 lie detector test can help confirm fidelity or uncover deception. We work with couples who want closure, evidence and a way to move forward—together or apart.
Employers and small businesses in Castle Douglas use our tests when money, stock or data has gone missing. We can test one person or a small group, and provide clear written reports for HR or internal investigations.
Being falsely accused can be devastating. Many clients in Castle Douglas use our P300 lie detector test to show friends, family or employers that they are telling the truth, backed by independent scientific evidence.
While no lie detector test is a replacement for a court, some solicitors and legal teams in Dumfries and Galloway use P300 brainwave reports as part of a wider case strategy. We can liaise with your legal representative if required.
A lie detector test is a serious step. We will always be honest about what P300 EEG can and cannot do so that clients in Castle Douglas make an informed choice.
Every test includes a detailed 12-page PDF report analyzing neural responses. This is the exact report you will get – you can also see your results explained here. Swipe through example pages below to see the depth of our forensic data.
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.
Documented outcomes from real P300 EEG investigations. Every case below was conducted using the same 8-channel BrainBit EEG system we use for appointments in Castle Douglas. View full case studies library
Employee suspected of stealing proprietary code. Our P300 EEG detected deception with 94% accuracy versus the polygraph's 52%. The subject attempted countermeasures that fooled the polygraph but had no effect on the EEG result.
Read full case
Key witness in a fraud case. Our EEG showed 93% accuracy identifying truthful responses where the polygraph was inconclusive at 48%. The evidence was accepted in civil proceedings.
Read full casePrivate client seeking clarity on infidelity suspicions. P300 EEG provided a 92% accurate result where the polygraph produced ambiguous 51% readings. The client was able to move forward with a clear answer.
Read full case
C-suite candidate screening revealed employment history discrepancies. EEG detected deception at 95% accuracy versus the polygraph at 59%, preventing a costly hiring mistake for the business.
Read full caseWorkplace injury claim verification. EEG revealed deceptive P300 patterns with 93% accuracy. The result saved the insurer over £250,000 in fraudulent payouts and supported their legal position.
Read full case
A financial firm suspected an employee of selling client data. EEG testing of five suspects identified the perpetrator with 94% accuracy through involuntary brain responses that could not be suppressed.
Read full caseControlled study documenting P300 response patterns and measurement accuracy using our medical-grade 8-channel BrainBit EEG system. Peer-reviewed methodology with full statistical validation.
Read full study
Controlled study of P300 recognition responses comparing innocent versus guilty knowledge paradigms. Our 8-channel BrainBit EEG achieved 95% accuracy detecting concealed information versus 48% polygraph reliability.
Read full studyControlled validation study comparing EEG versus polygraph accuracy in deception detection. Our 8-channel BrainBit achieved 93% accuracy versus 51% for the polygraph. Full calibration documentation included.
Read validation study
Ten participants from Manchester and Leeds with suspected unfaithful partners tested using 8-channel BrainBit EEG. All partners subsequently confirmed the test findings when presented with the results.
Read full studyAn individual denied cannabis use despite family concerns. EEG detected deception at 94% accuracy. Following the admission, we helped connect the individual with a recovery plan and employment support. Life transformed.
Read full case
A parent tested their 21-year-old son for cigarette smoking denial. A high P300 response detected deception. The son later admitted and quit smoking. A follow-up retest confirmed successful cessation.
Read full caseWe understand that booking a lie detector test in Castle Douglas is extremely personal. Your privacy, dignity and data security are our priority at every stage.
Whether you are the person booking or the person being tested in Castle Douglas, you will be treated with respect. We do not take sides; our role is to gather accurate scientific data and explain what it shows.
Watch how our brain-wave lie detector technology achieves 95% accuracy. Professional deception detection across the UK.
Our mobile P300 EEG units cover all of Castle Douglas and beyond, serving the entire Dumfries and Galloway region.
A snapshot of how individuals, families and organisations in Castle Douglas 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 (Castle Douglas)
“After months of doubt, the P300 test finally gave us clarity.
The examiner in Castle Douglas was calm, non‑judgemental and explained
every step so we knew exactly what the results meant.”
— Sarah M., Private Client (Castle Douglas)
“We now use P300 EEG 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 (Castle Douglas)
“The team brought the equipment to our office in Castle Douglas,
set everything up quickly and kept disruption to a minimum.
Professional from start to finish with clear, factual outcomes.”
— Corporate Client (Castle Douglas)
“P300 testing 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 (Castle Douglas)
"I had been suspicious for over a year. The P300 test gave me a definitive answer within the same day. The examiner was compassionate and professional throughout."
— Private Client (Castle Douglas)
"Stock had been going missing for months. P300 screening identified the source quickly. The certified report gave us everything we needed to proceed legally."
— Retail Manager (Castle Douglas)
"We were both tested on the same day. Both results came back clear. It sounds strange to say, but that report saved our relationship. We finally had proof to move forward."
— Couple, Private Clients (Castle Douglas)
"My business partner denied diverting client payments. The P300 result was unambiguous. We resolved the dispute within days of receiving the report."
— Business Owner (Castle Douglas)
"I was nervous about the process but the examiner put me at ease immediately. The whole session was under two hours and the report was with me the same evening."
— Individual Client (Castle Douglas)
"Following allegations against a staff member, we needed an objective assessment fast. The P300 team were with us within 48 hours and handled the situation with complete discretion."
— Care Home Manager (Castle Douglas)
"Used for a sensitive identity check as part of a legal matter. The process was explained clearly and the documentation provided was detailed and professional."
— Solicitor's Client (Castle Douglas)
"I called on a Tuesday morning and was tested that afternoon. The team were incredibly responsive and the urgency of my situation was taken seriously from the first call."
— Private Client (Castle Douglas)
"Our insurer recommended P300 EEG as part of a complex fraud investigation. The scientific rigour of the report was exactly what was needed at the tribunal stage."
— Legal Representative (Castle Douglas)
"I was falsely accused at work. The P300 result clearly showed No Deception Indicated. My employer accepted the report and the case was closed. I cannot thank the team enough."
— Employee, Private Client (Castle Douglas)
"The examiner travelled to our Castle Douglas premises, set up with minimal disruption and completed three assessments in a single morning. Highly recommended for corporate clients."
— Operations Director (Castle Douglas)
"My solicitor suggested P300 testing as supporting evidence in a custody matter. The report was thorough, clearly written and accepted without challenge by the opposing party."
— Private Client (Castle Douglas)
"From the first enquiry to receiving the report, every interaction was handled with complete confidentiality. The Castle Douglas team understood the sensitivity of our case perfectly."
— Family Client (Castle Douglas)
"We had unverified allegations of substance use affecting performance. P300 testing provided objective data without relying on hearsay. The process was fair and transparent for all parties."
— HR Manager (Castle Douglas)
"The written report arrived within four hours of the test. It was clear, well-structured and my legal team said it was one of the most professionally presented expert documents they had seen."
— Private Client (Castle Douglas)
"We have now used DeceptionDetection on four separate occasions across our Castle Douglas sites. The consistency in quality and process gives us complete confidence every time."
— Group Security Manager (Castle Douglas)
"A competitor appeared to be using our proprietary information. P300 screening of two key personnel quickly identified the source. The test saved us months of internal investigation."
— Tech Company Director (Castle Douglas)
"I had never done anything like this before and was very anxious. The examiner spent time explaining the science before we began. By the end I felt completely at ease with the process."
— Individual Client (Castle Douglas)
"My solicitor referred me to DeceptionDetection as part of building my case. The report format was exactly what was required and the examiner was available to answer follow-up questions from my legal team."
— Legal Client (Castle Douglas)
"My partner didn't believe me regardless of what I said. I requested the test myself to prove my honesty. The No Deception Indicated result changed everything between us."
— Private Client (Castle Douglas)
"Following a safeguarding concern involving a staff member, the governing body recommended independent P300 assessment. The process was handled sensitively and the outcome was clear."
— School Governor (Castle Douglas)
"I couldn't take time off work so I asked about a weekend slot. The team accommodated a Saturday morning appointment in Castle Douglas without any issue. Very flexible service."
— Private Client (Castle Douglas)
"Cash had been disappearing from the till over several weeks. After P300 screening of three staff members, the source was identified. The whole process cost far less than a private investigator would have."
— Small Business Owner (Castle Douglas)
"I needed to know the truth for my own peace of mind as much as anything else. The test gave me a definitive answer and I was able to stop second-guessing and move forward with my life."
— Private Client (Castle Douglas)
"A tenant denied causing significant damage to my property. P300 testing provided clear evidence that contradicted their account. The report was accepted by the small claims court without challenge."
— Landlord (Castle Douglas)
"I'm a sceptic by nature and came in with a lot of questions. The examiner explained the neuroscience behind P300 in plain English and showed me the raw data from my own test. Converted."
— Private Client (Castle Douglas)
"A sensitive matter involving access to patient records required a discreet, professional solution. The P300 team handled our Castle Douglas practice case with the highest level of confidentiality."
— Practice Manager (Castle Douglas)
"The £499 fixed fee seemed like a lot before the test. After receiving a clear result that ended two years of uncertainty, it was the best money I have ever spent."
— Private Client (Castle Douglas)
"Booked online at 11pm, had a confirmation call by 9am and was tested by lunchtime. The whole experience from booking to report was seamless."
— Individual Client (Castle Douglas)
"My PI recommended P300 EEG as the next step after their initial surveillance work. The two reports together built an extremely strong case. I would use both services again."
— Private Client (Castle Douglas)
"A manager was accused of persistent bullying. P300 testing provided objective evidence that supported the investigation findings. HR were impressed by the scientific rigour of the report."
— HR Director (Castle Douglas)
"My solicitor recommended P300 testing as supporting documentation for our immigration application. The certified report was professionally presented and accepted without question."
— Private Client (Castle Douglas)
"The examiner arrived at our Castle Douglas office at 9am and had completed three individual assessments by midday. Minimal disruption to the working day and a full report by close of business."
— Operations Manager (Castle Douglas)
"We received an anonymous tip that one of our directors was sharing confidential client data. P300 screening cleared the accused and redirected our investigation appropriately."
— Company Secretary (Castle Douglas)
"My son was accused of stealing from a classmate's family. As a parent I needed to know the truth. The examiner adapted the session appropriately and the result gave our family clarity."
— Parent, Private Client (Castle Douglas)
"Guest valuables had gone missing from two separate rooms. P300 screening of housekeeping staff resolved the investigation discreetly without involving police at that stage."
— Hotel General Manager (Castle Douglas)
"I was concerned about the physical side of the test. There are no needles, no uncomfortable sensors and no stress. Just a headset and a calm, professional examiner. Far easier than I expected."
— Private Client (Castle Douglas)
"Working with a support charity in Castle Douglas, P300 testing provided independent corroboration in a very difficult case. The examiner showed real sensitivity and professionalism throughout."
— Support Worker (Castle Douglas)
"A sibling alleged that a will had been altered after our parent's death. P300 testing provided critical evidence around knowledge of specific document details that only the forger would hold."
— Family Client (Castle Douglas)
"We suspected a driver was involved in cargo diversion. P300 testing confirmed our suspicions and the certified report supported our insurance claim and disciplinary process."
— Logistics Director (Castle Douglas)
"Before signing a pre-nuptial agreement, both parties agreed to voluntary P300 testing on financial declarations. It gave both families complete confidence in the process."
— Private Client (Castle Douglas)
"The P300 report was submitted as expert evidence at an employment tribunal. The opposing counsel did not challenge its validity and the tribunal referenced it positively in their findings."
— Employment Solicitor (Castle Douglas)
"I used DeceptionDetection twice over 18 months as my situation evolved. Both times the service in Castle Douglas was consistent, professional and the results were delivered with complete clarity."
— Private Client (Castle Douglas)
"A regulatory compliance issue required us to verify staff knowledge of a specific incident. P300 testing gave us a scientifically robust answer that satisfied both internal audit and our regulator."
— Compliance Officer (Castle Douglas)
"The examiner noticed I was distressed before we began and took time to check in with me properly before proceeding. That level of care made the whole experience far less daunting."
— Private Client (Castle Douglas)
"I had previously taken a polygraph elsewhere and felt the result was unreliable. The P300 EEG test in Castle Douglas was a completely different experience — far more scientific and far more convincing."
— Private Client (Castle Douglas)
"High-value tools and materials were disappearing from our Castle Douglas site. After screening four workers, the culprit was identified. We avoided a lengthy police investigation and recovered the losses."
— Site Manager (Castle Douglas)
"I spent months convinced my partner was lying. The P300 result showed no deception. I had to accept I was wrong. It was humbling but it saved my marriage. I am grateful we took the test."
— Private Client (Castle Douglas)
"Client funds had been misappropriated. P300 testing of two senior staff members produced clear Deception Indicated results on both. The report formed the centrepiece of our subsequent legal action."
— Senior Partner (Castle Douglas)
"I was on the verge of ending a ten-year relationship based on suspicion alone. The test result was clear. My partner was telling the truth. Booking that appointment was the best decision I ever made."
— Private Client (Castle Douglas)
Swipe or use the arrows to view more client reviews.
Every lie detector test in Castle Douglas is conducted by a certified, experienced specialist — not a subcontractor examiner.
Lead P300 EEG Examiner — Dumfries and Galloway Region
Mathew has over 11 years of experience in deception detection, having worked across personal, corporate and legal cases throughout the UK. He holds specialist certification in P300 EEG brainwave analysis and is trained in the full BrainBit 8-channel EEG system used on every Castle Douglas appointment.
Before founding DeceptionDetection.co.uk, Mathew spent seven years working alongside solicitors and HR investigators on complex fraud, theft and misconduct cases across the Dumfries and Galloway area. That background means he understands the difference between evidence that satisfies curiosity and evidence that holds up to professional scrutiny.
All Castle Douglas appointments are led personally by Mathew or a directly supervised member of his core team — never handed off to an unknown subcontractor. You will be told exactly who is attending before the day.
"Most clients arrive nervous — they think they're walking into something clinical and intimidating. My job is to make the process calm, clear and fair for everyone in that room. The science should speak for itself, and a good examiner makes sure it does."
— Mathew Oneill, Lead Examiner, Castle Douglas & Dumfries and Galloway
Questions before booking? Call 0161 524 5513 — Mathew or his team will answer directly.
Answers to the most common questions we receive about lie detector testing in Castle Douglas.
Your £499 investment covers a full professional examination in Castle Douglas. If you are in a rush, our £599 priority service guarantees an appointment as soon as possible.
Unlike a polygraph that usually sits around 65–75% accurate, P300 EEG in Castle Douglas focuses on whether the brain recognises specific information, giving you a clearer picture of truthfulness.
If you are in Castle Douglas and cannot wait, choose our Priority Booking option. We will fast-track your pre-test consultation and aim to test you today.
For accuracy, we normally limit each test in Castle Douglas to around 3–5 carefully crafted key questions. During your pre‑test consultation, we refine these together so each one is clear, specific, and answerable with yes/no.
Start the process by submitting an inquiry for Castle Douglas via our contact form. A senior examiner will review your case and contact you to finalize the booking.
You decide the location in Castle Douglas. If you have a quiet space at home, we can use that. If not, we will book a private room in a nearby business centre for you.
Yes — we come to you. We regularly conduct tests at clients' homes, local hotels (Premier Inn, Holiday Inn, ibis), business parks and private offices across Castle Douglas and the surrounding area. Just let us know your preferred location when booking.
Yes. Same-day appointments in Castle Douglas are available if you call before noon — these are £599. Next-day appointments are available 7 days a week from £499. Call 0161 524 5513 or book online and we'll confirm within the hour.
Before your appointment we work with you to prepare 3–5 precise yes/no questions tailored to your situation. These are sent to you for approval before the test day. When we arrive in Castle Douglas we review and confirm them with you, then begin EEG calibration. Nothing is sprung on either party.
Results for Castle Douglas tests are generated automatically by our forensic software to ensure objectivity. The examiner then verifies the data and emails you the PDF report straight away.
Guides, research and expert advice from our P300 EEG testing practice.
The complete guide to whether — and how — to approach P300 EEG testing when infidelity is suspected.
RelationshipThe behavioural patterns, what they mean, and when a lie detector test becomes the right next step.
RelationshipA refusal isn't proof — but it's not nothing either. What it means and what your options are.
RelationshipThe result said clear. Now comes the harder work — what helps, what doesn't, and what both partners need.
Mental Health4x increased depression risk. The research on what false accusations do — and what both sides need to know.
ResearchPeer-reviewed accuracy data, methodology comparison, and why the science has moved on from polygraph.
ResearchCountermeasures, coaching, and why the P300 brain response is involuntary — the science explained.
GuideFrom arrival to results. Exactly what to expect during your P300 EEG lie detector appointment.
If you are ready to move forward, we can usually offer appointments in Castle Douglas within the next 24–48 hours, and often sooner for urgent cases.
