Lie Detector Test Letterkenny — P300 EEG, at Your Home or a Venue Near You
Letterkenny clients book a Qualified P300 EEG examiner without going anywhere: we come to your home, or book a private room in town under our company name. From €599 for a single test, €949 for two people on the same visit. Written report before we leave.
Prefer to talk it through? Call +44 161 524 5513, Mon-Fri 8am-8pm. Not sure of dates yet? Ask first and we agree a date before you pay anything.
P300 EEG Testing Across Ireland
Booking for somewhere else? Tap a town for local pricing, venue type and FAQs specific to that location. Same examiner, same kit, same written report.
Don't see your town? Get in touch — every county in Ireland is covered, at your home or at a venue near you.
The not-knowing ends in Letterkenny today.
One visit. One examiner. One written report. The not-knowing ends today.
An answer you can trust
The question you've carried for months — sometimes years — is settled in a single 90-minute session. Examiner-led, evidence-based, built to be certain.
A result that holds up
Clear and written. A pass or a fail rather than an inconclusive, so you leave with a conclusion you can act on.
Your report in 1 hour
Written report in your hand before the examiner leaves — within the hour of finishing the test, whether that is at your home or at a venue in Letterkenny. No waiting days for an answer.
How a Letterkenny P300 EEG Test Actually Runs
The practical detail clients ask about most: where in Letterkenny the test happens, what the day looks like, what the written report includes and how payment works. Everything below is the same whether you book a single test or a two-person visit.
Home Visit in Letterkenny
Prefer to do this at home? The examiner comes to you, anywhere in Letterkenny or the surrounding area. The 4-channel BrainBit EEG kit sets up on an ordinary table in a few minutes. All we need is a quiet room for around 90 minutes.
Private Venue in Letterkenny
Rather not have it at home? We arrange a reserved suite at a Letterkenny town hotel, booked in our company name and confirmed to you in writing. Corporate premises also accepted for workplace investigations. Strict confidentiality from the front desk.
The Letterkenny Day
A pre-test interview, the P300 EEG examination itself, a short debrief and the analysis. Allow 60-90 minutes for the appointment plus up to an hour for the written report, which is handed to the paying client before they leave the venue.
The Report
8-page forensic report — raw waveform data, P300 spike analysis per probe question, deception score breakdown, methodology summary, signed certificate of examination. Issued only to the paying client; never copied or shared.
Confidentiality
The Letterkenny venue is booked under our company name, not yours. The examiner arrives in plain clothes with unmarked equipment cases. Nobody at the venue is told what the booking is for. Records are handled in line with GDPR.
Payment
Priced and charged in euro by card, so your bank makes no conversion. Enquiries can also be settled by SEPA, Wise or bank transfer. Book and pay online, or agree a date with us first and pay once it is confirmed in writing. Full payment secures the appointment, and every invoice carries our full company details so you always know exactly who you are dealing with.
Brain-Wave Testing. Not Sweat & Heart Rate.
For Letterkenny clients comparing options, here is the plain difference: a polygraph measures how stressed you are while you answer. The P300 EEG measures whether your brain recognises a specific detail you say you do not recognise. One is an emotional signal that can be triggered by anything from a divorce to a tax deadline. The other is a recognition signal tied to what is already in your memory.
Traditional Polygraph
- Measures stress responses — not truth directly
- Affected by nerves, anger and stress
- Chart interpretation depends on the examiner
- Typically a 2-3 hour session
- Physiological sensors on the body
- Limited availability in Letterkenny
P300 EEG (What We Do)
- Measures brain recognition — not emotional state
- Involuntary recognition response
- Nerves do not fail an honest subject
- 60-90 minute appointment
- Waveform record with every report
- Examiner comes to you in Letterkenny
Built for Letterkenny's Most Common Cases
Relationship doubts, family inheritance disputes, internal theft investigations and false accusations make up most of our work. The common thread is a contested factual question that needs a clear answer. The categories below cover the bulk of what clients in Letterkenny and across Ireland bring to us.Relationship doubts, family inheritance disputes, internal theft investigations and false accusations make up most of our work. The common thread is a contested factual question that needs a clear answer. The categories below cover the bulk of what clients in Letterkenny and across Ireland bring to us.Relationship doubts, family inheritance disputes, internal theft investigations and false accusations make up most of our work. The common thread is a contested factual question that needs a clear answer. The categories below cover the bulk of what clients in Letterkenny and across Ireland bring to us.
Relationship Trust
Private, discreet testing where trust in a relationship has broken down: disputed accounts of where someone was, messaging history disputes, or verifying a partner's statements before trust is rebuilt. Confidential venue, written report within 1 hour. Test both partners on the same visit for €949.
Family & Household
Theft in the home, inheritance disputes, adult children under suspicion, sibling disagreements, or accusations within blended families. Clear, objective answers without police involvement.
Business & Workplace
Specific-incident investigations with employee consent — missing stock, data leaks, suspected fraud, internal misconduct allegations. Test multiple suspects on one visit for significantly lower per-test cost.
False Accusations
If you've been accused of theft, dishonesty or misconduct at work or in your personal life, a passed P300 EEG test provides objective brain-wave evidence that you're telling the truth — far more robust than your word alone.
Pre-Relationship / New Partner
Past behaviour verification, dating-profile honesty, discrete checks before a serious commitment. Used quietly by many Letterkenny clients before getting engaged, buying property together, or introducing someone to children.
Second Opinion
Previously failed a polygraph elsewhere and want an independent P300 EEG test on the same facts? P300 measures brain recognition, not anxiety — so a nervous polygraph result doesn't predict a P300 result. Clean slate, different technology.
What Letterkenny Clients Say
★ 4.9 / 5 · based on 499 verified reviews across Deception Detection UK
Clear written report within the hour as promised
"I had been told by previous providers that reports take days. The examiner handed me a bound written report before I left the venue. That alone made the difference for what I needed it for."
Cleared my name after a workplace theft accusation
"I was wrongly accused of taking cash from the till at work. The P300 test cleared me categorically and my employer reinstated me with backpay. The written report was the difference between losing my career and keeping it."
Two suspects tested on the same visit saved real money
"Our small business had a stock-shrinkage problem narrowed to two warehouse staff. Testing both on the same day cost half what two separate trips would have. One passed cleanly, one did not — case closed."
Polygraph elsewhere was inconclusive — P300 was definitive
"Took a polygraph in London first and the result came back inconclusive after two attempts. Booked a P300 EEG with these guys, got a clear definitive verdict in a single session. Different technology, different result."
Pre-engagement honesty check before a big decision
"My partner and I both took the test before getting engaged. It sounds extreme but for us it settled some lingering doubts cleanly and we are now happily engaged. The two-person rate made it doable."
One Test or Two — The More You Book, The Better the Rate
Letterkenny pricing covers everything: the examiner coming to you, the booked venue if you want one, the full P300 EEG examination, waveform analysis and the written report. The single biggest saving is the two-person visit at €949, against €1,198 for two separate single bookings.Letterkenny pricing covers everything: the examiner coming to you, the booked venue if you want one, the full P300 EEG examination, waveform analysis and the written report. The single biggest saving is the two-person visit at €949, against €1,198 for two separate single bookings.
Single Test
Lie detector testing for 1
- Home visit or venue
- Full P300 EEG examination, 60-90 minutes
- Written report in your hand within 1 hour
- Full payment required to confirm booking
- Best if timing is flexible
Two-Person Visit
Most popular — save €249
- Two separate full P300 EEG tests
- Both tests same day, same venue
- Ideal for couples, business partners, families
- Individual written reports for each person
- Saves €249 vs two single bookings
Testing 5 or more people (e.g. a workplace investigation)? Contact us for a group rate.
From First Message to Written Report
Initial Enquiry
Email or contact form. We'll reply within 1 hour with a confidential call to discuss your case.
Case Review
We confirm the right option (single or two-person), draft proposed test questions, and send a written quote.
Booking & Scheduling
We agree a date that suits you and confirm it in writing; full payment then secures it. Venue in Letterkenny: your home, or a private room we book nearby.
Testing in Letterkenny
The examiner arrives at your home or the venue with the EEG kit. Pre-test interview, the P300 examination and a post-test debrief, all on the same day.
Written Report
Formal written report with waveform analysis and findings Issued to you only.
Common Questions From Letterkenny Clients
Wherever suits you. Most Letterkenny clients choose one of two options: a home visit, or a private room we book under our company name, typically a reserved suite at a Letterkenny town hotel. Corporate premises work too for workplace matters. Nobody at the venue is told what the appointment is for, and the written report is handed to you before the examiner leaves.
Yes, and it is the most popular way to book. Each additional person on the same visit is €349, because the examiner is already with you and the venue is already covered. Two tests on the same day cost €949 rather than €1,198 as two single bookings; three cost €1,298. Five or more, get in touch for a group rate. Ideal for couples, business partners, family members in a dispute, or staff in a specific-incident investigation.
A traditional polygraph measures anxiety: breathing, heart rate and sweat. P300 EEG measures a brain response that appears when your brain recognises a detail you have seen or done before. It asks a different question, recognition rather than stress, so a nervous but honest person is not penalised for being nervous and a calm person is not credited for being calm. The published research on the method is summarised in the note at the foot of this page.
Strictly confidential. Tests take place in private booked venues. Reports are issued only to the paying client. We operate under GDPR and do not share, store or disclose any case information to third parties without written instruction. Nothing is filed with any authority, employer or family member unless you explicitly ask us to.
Very common reason for booking us. Traditional polygraph results can be distorted by nerves, medication, medical conditions, or poor question design — a genuinely truthful person can fail simply by being anxious. P300 EEG measures something different: brain recognition, not anxiety. A P300 test on the same underlying facts can provide a clear, independent second result.
Priced and charged in euro by card, so your bank makes no conversion. Enquiries can also be settled by SEPA, Wise or bank transfer. You can book and pay online, or ask a question first, agree a date, and pay once it is confirmed in writing. Full payment secures the appointment. Every quote and invoice carries our full company details: DadLink Technologies Limited, trading as Deception Detection UK, company number 16161444, with an Irish address in Longford and a UK office in Cheshire.
Tests are conducted in English. If the subject needs an Irish Gaelic or Polish interpreter, we can arrange one locally — just raise this at the enquiry stage so we can factor it into scheduling.
If you are in Belfast, Derry or elsewhere in Northern Ireland, you are covered by our UK service at £499 sterling, booked through the UK page rather than this one. Book directly through our UK booking page.
What You Get After Your Lie Detector Test
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.
Deception Score Analysis
Granular breakdown of deception scores calculated from specific neural biomarkers.
Executive Summary
Clear, definitive results indicating deception probability and overall risk assessment.
Official Certificate
Signed certification of examination suitable for verification purposes.
Raw Data Export
Full transparency with access to the raw visual data used to generate the final conclusion.
Neural Response Timeline
Millisecond-by-millisecond timeline of brain activity in response to probe stimuli.
Question Category Breakdown
Comparative analysis of responses to relevant, irrelevant, and control questions.
Cognitive Load Metrics
Analysis of response latency indicating increased cognitive load during deceptive answers.
Component Amplitude Data
Scientific validation of P300 wave amplitude and latency specific to the subject.
Real Case Studies from Our Lie Detector Testing
Documented outcomes from real P300 EEG investigations. Every case below was conducted using the same 8-channel BrainBit EEG system we use for appointments. View full case studies library
Tech Company Internal Theft
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
Witness Credibility Assessment
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 caseRelationship Trust Verification
Private 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
Executive Background Check
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 caseFraudulent Injury Claim Detection
Workplace 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
Insider Threat Investigation
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 case8-Channel BrainBit P300 Validation
Controlled 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
P300 Recognition Memory Research
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 studyDeception Detection Validation (n=12)
Controlled 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
Partner Infidelity Detection 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 studyCannabis Use Detection and Recovery
An 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
Smoking Cessation Verification
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 caseBuild Your Test Questions
Tell us your situation in plain English. Our AI will generate 3 professionally worded yes/no questions.
Here are your 3 suggested P300 test questions:
These questions are ready to use. Book your test and we'll confirm and finalise them with you before the session.
Book My Test →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.
Your Examiner
Every lie detector test is conducted by a certified, experienced specialist — never a subcontractor.
Mathew Oneill
Founder & Lead P300 EEG Examiner — Nationwide
Mathew has conducted P300 EEG examinations across corporate, legal and private cases throughout the UK. He holds specialist certification in P300 brainwave analysis and operates the 4-channel BrainBit EEG system used on every appointment.
Mathew has spent over seven years building, testing and refining P300 EEG protocols — analysing thousands of brainwave recordings to improve detection accuracy and develop the evidence-grade reporting system used on every case today. That depth of hands-on research means he understands the difference between a result that satisfies curiosity and one that holds up to professional scrutiny.
All 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.
- ✅ P300 EEG Certified
- ✅ Full UK DBS Checked
- ✅ Legal Report Writing
- ✅ Professional Indemnity Insured
- ✅ HR Investigation Experience
- ✅ ICO Registered (UK GDPR)
- ✅ Trauma-Informed Practice
- ✅ 300+ Tests Conducted
"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, Founder & Lead Examiner
P300 EEG Lie Detector Tests in Nearby Cities
Same examiner, same kit, same written report. Every town below is covered exactly like Letterkenny: a home visit, or a private venue we arrange locally.
Navan
P300 EEG lie detector test in Navan, Leinster. Home visit or private venue.
Carlow
P300 EEG lie detector test in Carlow, Leinster. Home visit or private venue.
Mullingar
P300 EEG lie detector test in Mullingar, Leinster. Home visit or private venue.
Naas
P300 EEG lie detector test in Naas, Leinster. Home visit or private venue.
Ready to Book a P300 EEG Test in Letterkenny?
Letterkenny case ready to move forward? Get in touch and we will confirm your case fits the service, draft proposed test questions with a written quote, and book the date. Two-person visits at €949 are the most popular option for couples, families and business partners.Letterkenny case ready to move forward? Get in touch and we will confirm your case fits the service, draft proposed test questions with a written quote, and book the date. Two-person visits at €949 are the most popular option for couples, families and business partners.