Workplace Theft Investigation Lie Detector Test — UK Wide
Employee theft costs UK businesses £190 million per year. If your the UK business has a theft you cannot resolve through CCTV, audit or witness statements, our P300 lie detector test gives you an objective investigation input on specific contested factual claims. £499 standard. £399 per additional employee in same session. On-site at your premises available.
£499
Per Employee
£399
Each Additional
£190M
UK Annual Loss
On-Site
At Your Premises
Get the clarity you need Today.
No more guessing, no more sleepless nights. A definitive answer, in a single session.
A real answer, at last
The question that's followed you for months — sometimes years — is resolved in one 90-minute session. Examiner-led and evidence-based, so you can trust what it tells you.
In writing, and it holds up
A clear, written, defensible result. No "inconclusive", no grey areas — a conclusion you can stand behind and actually use.
Same day, anywhere in the UK
Your report is in your hand within the hour, before you leave the room. Same-day appointments available nationwide.
Workplace Theft Investigation Lie Detector Testing in the UK — Honest Service Description
Workplace theft investigations in the UK have a structural problem. The cost is real — UK businesses lose an estimated £190 million per year to employee theft, with average commercial crime losses of £140,000 per incident, and Freedom of Information data from 43 police forces shows employee theft offences rose 19 percent year on year. But the investigation tools available to most employers are limited. CCTV often does not cover the location of the theft. Stock audits identify the loss but not the person. Witness statements are unreliable, especially in close-knit teams. Police involvement for sub-£5,000 employee thefts almost always goes nowhere. The case sits unresolved, and the responsible party often steals again. The P300 lie detector test gives the UK employers a tool that addresses exactly this gap: an objective brain-recognition test on specific contested factual claims, conducted with the employee's voluntary consent, producing a signed independent report that goes into your investigation file. Not court evidence — never court evidence — but credible investigation input alongside CCTV, audit trails and witness statements. £499 per employee. £399 per additional employee tested in the same session. We are upfront about the ACAS Code of Practice on Discipline and Grievance: the test must not be the sole basis for disciplinary action. Used correctly it supports a fair-procedure investigation.
Conventional workplace theft investigation in the UK relies on CCTV (often inadequate coverage), audit trails (identifies loss not perpetrator), and witness statements (unreliable in close-knit teams). The P300 test fills the gap none of these address — direct objective input on whether a specific employee shows brain recognition consistent with knowledge of case-specific details. It does not replace your other investigation tools. It adds the one piece of objective input your investigation otherwise lacks.
How the P300 Test Helps Workplace Theft Investigations
Six concrete ways our the UK employer clients use the test result. The test is investigation input, not a disciplinary verdict — and we are explicit about that in every report so your investigation file is ACAS-compliant.
Narrow a Suspect Group
When CCTV, audit and witness statements have identified three to eight possible employees but cannot point to the responsible party, testing each consenting employee on specific contested factual claims narrows the investigation efficiently.
Clear Innocent Employees
Honest employees in a suspect group often want their names cleared. The test gives them a way to do that on the record. Several of our cases resolve not by identifying the responsible party but by clearing those who were unfairly under suspicion.
Prompt Voluntary Confession
A known pattern across the industry: the responsible party often confesses before the test happens. The prospect of an objective test shifts their calculation — confessing privately is preferable to taking a test they expect to fail. Many cases resolve at the briefing stage.
ACAS-Compliant Investigation Support
Our reports are explicitly formatted as investigation support — not as a disciplinary verdict. That framing protects your fair-procedure investigation from wrongful-dismissal claims while still adding objective material to the file.
Cost-Effective Resolution
For sub-£5,000 employee thefts where police involvement goes nowhere, a £499 to £2,500 internal investigation cost is far better value than legal proceedings — and crucially, much more likely to identify the responsible party.
Deterrence Signal
The existence of lie detector testing as part of the loss-prevention programme is itself a deterrent to the wider workforce. Retail and hospitality groups on retainer report measurable shrinkage reductions after publicly adopting the policy.
Important: employee voluntary informed consent is mandatory. We will not test anyone who has not actively consented. Refusal alone is NOT lawful grounds for disciplinary action — your investigation must be able to proceed without the test if necessary. The test is investigation input alongside CCTV, audit trails and witness statements, never a sole basis for dismissal.
Common Workplace Theft Investigation Scenarios
The four most common contexts where the UK employers instruct the test. Each has slightly different question design, suspect-pool dynamics and on-site logistics.
Retail Till & Cash Drawer Theft
Multiple till shortages over consecutive shifts, suspect pool of three to eight cash-handling staff. CCTV may show the act but not identify the person clearly. Multi-employee session at the store the UK or off-site.
Stock Shrinkage & Warehouse Theft
Audit identifies the loss but not the perpetrator. Back-of-house, distribution centre, or stockroom theft with limited CCTV. We test the access-credentialled employee group on-site at your the UK premises.
Hospitality Cash & Tip Theft
Bar tills, restaurant cash, hotel guest theft. High employee turnover, multi-shift access, often disputed between specific shift teams. Multi-employee sessions especially common in this vertical.
Financial Controls / IP Theft
Office, family business, or small firm where the suspect pool is small and the breach is financial (false expenses, supplier kickbacks) or data-related (customer lists, IP exfiltration). Office-based testing.
How the Booking Works
Five stages from submitting the booking form to the report landing in your inbox. Same process whether your test is next week or this afternoon.
Fill Out the Booking Form
Submit your details online. Takes under two minutes. No payment until the booking is confirmed by phone.
Assessor Calls You Back
Within minutes an assessor calls to finalise the questions, confirm your the UK location and discuss what the test can do for your specific situation.
Examiner Dispatched
The examiner travels to your private venue in the UK — your home, a hotel room, anywhere private.
Test On Site
The eight-channel EEG test runs for around twenty minutes. The brainwave response cannot be faked.
Report Within One Hour
The written report is dispatched encrypted to your email within one hour of the test ending. Comprehensive and fully detailed.
Same-day available: Book before 1pm for same-day testing in the UK. Evening tests until 9pm.
What the Test Can and Cannot Do — Honest Version
We will not oversell this. Knowing the limits up front means you book with realistic expectations and use the report effectively.
What the test CAN do
- Provide objective investigation input on specific contested factual claims, with 90 to 95 percent accuracy
- Narrow a suspect group of three to eight employees efficiently
- Clear innocent employees who want their names cleared on the record
- Often prompt voluntary confession before testing begins — a known pattern in this work
- Sit alongside CCTV, audit trails and witness statements in the investigation file
- Work reliably when employees are anxious — recognition responses happen before stress can develop
- Resolve sub-£5,000 thefts cost-effectively where police involvement would go nowhere
- Send a deterrence signal to the wider workforce when used as part of a loss-prevention programme
What the test CANNOT do
- Be admitted as evidence in an employment tribunal — lie detector reports are not tribunal evidence
- Be the sole grounds for disciplinary action — that creates wrongful-dismissal claim risk
- Replace CCTV, audit trails, witness statements, or proper investigation process
- Override the ACAS Code of Practice on Discipline and Grievance — fair procedure still required
- Be conducted without the employee's voluntary informed consent
- Be used to coerce employees — refusal alone is NOT lawful grounds for disciplinary action
- Fish for protected-characteristic information or anything outside agreed scope
- Recover the lost money — the test identifies the responsible party; recovery is a separate process
Why we say this up front: workplace theft is the area where employers most often get badly burned using lie detector reports — by treating the test as a disciplinary verdict rather than investigation input. Wrongful-dismissal claims following improper procedures cost UK employers an average of £14,000 plus legal costs. Our reports are formatted explicitly to support a fair-procedure investigation, not to undermine it. We are happy to brief your HR director or employment lawyer directly before you commit.
Where We Can Conduct the Test in the UK
The test does not require a clinic. The equipment is portable and the test runs in any private quiet space for around ninety minutes total including setup.
Your Home
Most common venue. Any quiet room with a chair and table works. The kit is professional but unobtrusive.
Hotel Meeting Room
For maximum discretion we regularly use Premier Inn, Holiday Inn, ibis and similar across the UK.
Office or Serviced Room
Your office, a serviced meeting room, or any private business space works for the test.
Anywhere Private in the UK
Serviced apartment, conference centre, private rental. Tell us your situation and we help find a venue.
Pricing — Transparent and Inclusive
No hidden fees. No travel surcharges within mainland UK. The price you see is the total cost of the test, the examiner attendance and the written report.
One employee, single investigation
- Full eight-channel P300 EEG test
- Signed independent expert report
- Report goes to employer AND employee
- Same-day option £599
- Examiner attendance UK mainland
Investigate a suspect group on-site
- £499 for the first employee
- £399 per additional employee in same session
- Examiner attends your premises
- Three to eight employees in one day typical
- Individual reports per tested employee
- Same-day or scheduled depending on prep time
Multi-site loss prevention programme
- Standard rate locked for 12 months
- Priority scheduling within 48 hours
- Dedicated named account manager
- Monthly consolidated invoicing
- Multi-site coverage across UK mainland
- Direct line for loss-prevention managers
Why P300 EEG Wins Where Polygraph Creates Wrongful-Dismissal Risk
Workplace investigations are exactly the wrong use case for polygraph testing — and exactly the right use case for P300 EEG. Here is precisely why the technology distinction matters when an employee's job is on the line.
Brainwave Response (Our Test)
Clean spike at 300ms — recognition confirmed. Involuntary. Cannot be faked.
One clear, measurable response. Cannot be faked. 90–95 percent accurate.
Traditional Polygraph
Chaotic stress signals — sweat, heart rate, breathing. Anxiety looks identical to deception.
Around 60 percent accurate. Anxiety can make innocent people fail.
Why This Matters in Workplace Theft Investigations
Employees being investigated for workplace theft — whether guilty or innocent — are under extreme stress. Their job is on the line. Polygraph measures stress responses. That is why innocent employees fail polygraph tests, why courts decline to admit polygraph evidence, and why ACAS-aware employment lawyers advise against relying on polygraph reports in disciplinary investigations. P300 EEG measures involuntary brain recognition that occurs in milliseconds — before stress can develop. The nervous innocent employee produces the same result as the calm innocent employee.
Accuracy figures from peer-reviewed research including Farwell & Donchin 1991, P300 neuroscience overview, and subsequent independent replication studies.
Real Workplace Theft Investigation Outcomes
Anonymised real outcomes from the UK employers, HR directors and family-business owners who used the test as one input in their investigation. Every detail changed enough to protect privacy. The test does not deliver the disciplinary decision — these cases show what it can contribute when used appropriately as investigation support. View the full case studies library →
Responsible Party Confessed Before Testing Began
A small the UK retailer had till shortages totalling £3,800 over six weeks. Four employees had till access. CCTV did not cover the relevant till. With each employee's consent the owner instructed a multi-employee session. Within 48 hours of the briefing meeting one employee asked for a private conversation and confessed, agreed a repayment plan, and resigned. The session was cancelled. The total cost to the business was the briefing fee — and the matter was resolved cleanly within a week.
Read full case →
Six-Employee Session Cleared Five, Identified One
A warehouse operator was losing high-value stock items consistent with internal theft. Suspect group of six employees with stockroom access. Multi-employee session on-site over one day. Five employees cleared on the specific contested factual questions; one showed strong recognition response on the agreed probes. That employee was subsequently interviewed by management with a union representative, additional evidence emerged from a fresh review of swipe-card logs, and the matter went to formal disciplinary process. The five cleared employees were named in the closing report — a point the owner valued.
Read full case →Family Member Cleared, Outsider Identified
A family-owned the UK business had unexplained cash discrepancies. The suspect pool included two family members and one long-standing employee. The family-member accusations were destroying relationships. A four-person voluntary session resolved the situation: both family members were clearly cleared on the test, and the long-standing employee showed strong recognition response. He was offered the opportunity to discuss the matter privately and confessed. The family relationships were restored. The owner described the neutralising of the family accusations as more valuable than identifying the responsible party.
Read full case →
Bar Manager Cleared, Honest Workforce Restored
A the UK bar group was losing approximately £800 per week from one venue. The bar manager was under suspicion from area management — informally rather than formally. He requested the test voluntarily to clear his name on the record. The test cleared him decisively. The investigation refocused on shift-handover procedures and identified a pattern with two part-time staff that conventional review had missed. The bar manager was promoted six months later. The cost of the test for the manager: £499. The cost of letting him quit under unfounded suspicion: incalculable in goodwill terms.
Read full case →Departing Employee Tested on Specific Data Claim
A professional services firm suspected a recently departed employee had taken client data on exit, in breach of their employment contract. The employee denied it. With voluntary consent, a P300 test was conducted on the specific contested factual claim about whether named documents had been copied. The test was clearly consistent with recognition. The legal team used the report as one input in correspondence with the former employee, who subsequently agreed to certified destruction of the disputed material under an undertaking. Litigation was avoided. The test was one piece of leverage in a settlement, not the basis for a court claim.
Read full case →
Multi-Site Loss Pattern Resolved After Group Test
A the UK construction firm had tool and materials losses across three sites totalling around £18,000 over four months. The pattern suggested either one mobile insider or several at different sites. A multi-employee session of eight site workers (across all three sites) resolved the matter: two workers showed recognition responses consistent with knowledge of specific case details; six were cleared. Subsequent investigation supported the test result with additional evidence. Both responsible workers were dismissed following fair procedure; the firm recovered partial value through a civil agreement. The session cost £3,290 total — a fraction of the loss.
Read full case →Reviews from Employers and HR Directors
Verified reviews from the UK employers, HR directors, family-business owners, security managers and loss-prevention teams who used the test as one piece of input in their workplace theft investigation. Aggregate rating 4.9 of 5 from 499 reviews.
Till shortages of nearly £4,000 over six weeks. Four staff with till access. Within 48 hours of the briefing meeting one employee asked for a private conversation and confessed. Repaid in monthly instalments, resigned without a fuss. The briefing alone resolved it.
Warehouse stock losses pointing to internal theft. Six employees tested in one day on-site. Five clearly cleared, one showed strong recognition. Subsequent investigation supported the test result. The five cleared employees were named in the closing report — that mattered for morale.
Family business cash discrepancies. Two family members under suspicion alongside one long-standing employee. The test cleared both family members and identified the long-standing employee, who then confessed. The relationships were restored. The neutralisation of the family accusations was more valuable than identifying the responsible party.
Bar manager under informal suspicion. He requested the test voluntarily to clear his name. Test cleared him decisively. Investigation refocused and identified a pattern with two part-time staff. He was promoted six months later. £499 saved a long-standing manager from leaving under a cloud.
Departing employee suspected of taking client data. P300 test on the specific contested factual claim about specific named documents. Result supported recognition. The report was one input in correspondence with the former employee — settled with certified destruction undertaking. Avoided expensive litigation.
Construction tool theft across three sites. Eight site workers tested. Two showed recognition, six were cleared. Dismissed both following fair procedure. Civil agreement recovered partial value. Session cost £3,290 against £18,000 loss. Most importantly the test gave us the basis for fair disciplinary action.
Honest about the limits. They told me explicitly the test would not be tribunal evidence, refusal would not be grounds for dismissal, the test had to sit alongside other evidence. That candour was exactly why our employment lawyer signed off on using their reports in the investigation.
Retainer arrangement across our hospitality group. Multi-site loss-prevention programme. Sit alongside CCTV, audit, witness statements as one structured investigation tool. Shrinkage measurably reduced once the policy was publicly adopted — the deterrence effect is real.
Articles on Workplace Theft Investigation
Deeper context on running ACAS-compliant theft investigations, when the test fits, and how it sits alongside CCTV, audit and witness statements.
How to Run an ACAS-Compliant Workplace Theft Investigation
The five stages of a fair-procedure investigation: documentary evidence, witness statements, suspect identification, voluntary lie detector testing, weighing the full evidence. Where the test fits and where it does not.
Read article →Till Theft and Cash Shortages — When to Bring in a Lie Detector Test
Multiple till shortages, suspect group of three to eight cash-handling staff, CCTV inconclusive. The multi-employee on-site session, who to test, what to test.
Read article →Warehouse Stock Shrinkage Investigation
When audit identifies the loss but not the perpetrator. How the swipe-card log plus voluntary multi-employee testing narrows the investigation efficiently.
Read article →Bar Manager Theft Allegations — Clear Their Name Properly
Informal suspicion in hospitality is corrosive. The voluntary test offered by the manager themselves is one of the few ways to clear the situation on the record.
Read article →When the Suspect Pool Includes Family Members
The lie detector test creates a structured neutral process that takes the personal element out of the family-business investigation. The neutralisation often matters more than the result.
Read article →Data Exfiltration by Departing Employees
P300 test on the specific contested factual claim about whether named documents were copied — one piece of leverage in a settlement, not court evidence.
Read article →Why Polygraphs Create Wrongful-Dismissal Risk in Theft Cases
Stressed innocent employees fail polygraph tests. P300 EEG measures recognition responses before stress can develop. Why the technological distinction matters for employment law.
Read article →Lie Detector Testing as Part of a Loss-Prevention Programme
Retail and hospitality groups using the test as part of a publicly adopted loss-prevention policy report measurable shrinkage reductions. The deterrence effect is real but only with the right framing.
Read article →Further Reading
On this site
External authoritative sources
Workplace Theft Investigation FAQ — the UK
The questions employers, HR directors and security managers most often raise at the case briefing. Tap each one to expand.
Is workplace theft lie detector testing legal in the UK?
Does the employee have to consent to the test?
Can the test result be admitted in an employment tribunal?
Can we use the test instead of CCTV, audit or witness statements?
What if an employee refuses to take the test?
How does multi-employee session pricing work?
Do you brief our HR director or employment lawyer before we commit?
What industries do you most commonly work in?
How quickly can we get employees tested in the UK?
Does the tested employee get a copy of the report?
Can a guilty employee beat the P300 test through controlled breathing or other countermeasures?
Can the test recover the lost money?
Speak to a senior examiner about your the UK workplace theft case before instructing. We will tell you honestly whether the test is the right tool for your specific investigation — and how to use it in an ACAS-compliant disciplinary process.
Submit the booking form and an assessor calls within minutes. The first conversation is free and confidential — we will give you an honest assessment of whether the test can help your specific situation before you commit to anything.
Last updated: 25 May 2026