Workplace Theft or Fraud: When Should a South African Employer Use a Polygraph Test?

V3 Polygraph & Investigation Services

When stock disappears, cash goes missing, confidential information is leaked or fraud is suspected inside a business, management is often faced with the same problem:

You know something happened — but you don't know who was involved.

This is where a properly conducted polygraph examination can become a valuable part of an internal investigation.

Polygraph testing can help an employer narrow an investigation, assess information supplied by employees and identify areas that may require further investigation.

However, a polygraph should be used correctly.

It is not a shortcut to finding someone guilty, and the result should not be treated as the only evidence against an employee.

Understanding when and how to use a polygraph is therefore important for South African employers.

What Is a Polygraph Examination?

A polygraph examination is a structured investigative procedure during which physiological responses are recorded while an examinee answers carefully formulated questions.

The process generally includes:

• a pre-test interview;

• explanation of the examination procedure;

• discussion and review of the questions;

• collection of physiological data;

• professional analysis of the collected information; and

• reporting of the findings.

The purpose of a professional polygraph examination is not simply to connect someone to a machine and ask whether they committed an offence.

A properly conducted examination requires preparation, appropriate question formulation, informed participation and professional interpretation of the results.

When Can Polygraph Testing Help an Employer?

There are several workplace situations where polygraph testing may assist an investigation.

1. Theft of Stock or Company Property

Consider a warehouse where valuable stock repeatedly disappears.

Access may be limited to twelve employees, but management has no direct evidence identifying the person responsible.

Interviewing twelve people may produce very little useful information.

A structured polygraph investigation may assist management in narrowing the investigation and determining where additional attention should be focused.

This can be particularly useful in environments involving:

• warehouses;

• logistics operations;

• retail businesses;

• manufacturing facilities;

• security companies;

• mining operations;

• distribution centres;

• vehicle fleets;

• cash-handling environments.

2. Cash Shortages

Cash-related losses can be extremely difficult to investigate when several employees have access to the same money, till, safe or cash-handling process.

Polygraph examinations may be considered where there is a properly defined incident involving:

• missing cash;

• unexplained till shortages;

• missing deposits;

• cash-in-transit discrepancies;

• manipulation of financial records;

• unauthorised refunds;

• false transactions.

The important point is that the examination should focus on a specific and properly investigated issue, rather than simply asking broad questions about whether an employee is trustworthy.

3. Fraud and Dishonesty

Internal fraud can take many forms.

Examples include:

• falsifying documents;

• manipulating invoices;

• creating fictitious suppliers;

• unauthorised payments;

• expense fraud;

• payroll manipulation;

• misrepresentation;

• collusion with suppliers or customers;

• deliberately providing false information during an investigation.

Where management has reasonable concerns about a particular incident, polygraph examinations can form one part of a wider investigative process.

4. Collusion Between Employees and Outsiders

Not every workplace crime is committed by an employee acting alone.

Employees may sometimes provide outsiders with information such as:

• security procedures;

• alarm information;

• delivery schedules;

• access codes;

• stock locations;

• cash movement schedules;

• confidential business information.

There may also be collusion involving customers, contractors, suppliers or organised criminal groups.

A properly planned polygraph examination can help investigators explore whether individuals had knowledge of or involvement in a defined incident.

5. Information Leaks

Information can be as valuable as physical property.

Businesses may suffer serious damage when confidential information is deliberately disclosed, including:

• customer information;

• pricing structures;

• tender information;

• passwords;

• intellectual property;

• security information;

• business strategies;

• employee information.

When the group of people who had access to the information can be identified, polygraph testing may assist the investigation.

Can an Employer Force an Employee to Take a Polygraph Test?

This is where employers need to proceed carefully.

The CCMA's guidance on polygraph testing explains that an employee generally may not simply be compelled to undergo a polygraph examination unless the employee agrees or an applicable employment contract or collective agreement provides for it.

The circumstances and documentation surrounding the examination therefore matter.

Before an examination takes place, the employee should understand:

• why the examination is being requested;

• what the examination involves;

• what issue is being investigated;

• how the results may be used;

• who will receive the results.

V3 Polygraph & Investigation Services places considerable importance on informed consent, professional procedure and impartial examination.

Can Someone Be Fired Because They Failed a Polygraph?

Employers should be especially careful here.

A polygraph result should not be viewed as automatic proof that an employee committed theft, fraud or another offence.

South African labour authorities and courts have repeatedly considered the evidential role of polygraph examinations.

The general principle is important:

A polygraph result can support or guide an investigation, but it should not be treated as conclusive proof of guilt on its own.

For example, additional evidence could include:

• CCTV footage;

• access-control records;

• witness statements;

• financial records;

• vehicle tracking information;

• stock records;

• emails or electronic records;

• admissions;

• documentary evidence;

• inconsistencies in explanations;

• other investigative findings.

A strong investigation combines information rather than relying on a single source.

Employers considering disciplinary action should obtain appropriate labour-law advice and follow a fair disciplinary process.

What Happens During a Workplace Polygraph Investigation?

At V3 Polygraph & Investigation Services, the process begins before the examinee sits down for the examination.

Step 1: Understand the Incident

We first need to understand:

• what happened;

• when it happened;

• what was lost or compromised;

• who had access;

• what investigation has already taken place;

• what evidence is available.

Without understanding the incident, meaningful examination questions cannot be developed.

Step 2: Determine Who Should Be Examined

Not everyone in a business should automatically be subjected to an examination simply because an incident occurred.

The investigation should establish a reasonable group of relevant individuals.

For example, if only six people had access to a secure warehouse during the period in which stock disappeared, the investigation should concentrate on the relevant facts and access.

Step 3: Develop the Examination Questions

Question formulation is one of the most important parts of the process.

Questions should relate to the specific issue under investigation.

Broad or emotionally loaded questions can reduce the value of an examination.

The examiner therefore reviews and discusses the questions before testing begins.

Step 4: Conduct the Examination

The examinee is taken through the procedure and relevant questions before physiological data is collected.

Testing should take place in an appropriate environment with minimal interruption.

Step 5: Analyse and Report

The examiner analyses the examination information and communicates the results according to the agreed procedure.

Where appropriate, the findings can then be considered alongside the rest of the investigation.

A Polygraph Is Most Powerful When Used as Part of an Investigation

A common mistake is contacting a polygraph examiner and saying:

“Something was stolen. Test everyone and tell us who did it.”

That is not the ideal approach.

The better approach is:

Incident → Preliminary Investigation → Identify Relevant Individuals → Polygraph Examination → Further Investigation → Decision

This produces a more structured and defensible process.

Polygraph testing can therefore be particularly valuable as an investigative filtering and information-gathering tool.

Prevention Can Be Better Than Investigation

Businesses do not necessarily need to wait until a major incident has already occurred.

Depending on the organisation, its policies and applicable law, integrity-focused screening can form part of a broader risk-management strategy for employees working in sensitive or high-trust positions.

These may include positions involving:

• cash;

• high-value stock;

• confidential data;

• security systems;

• controlled substances;

• company vehicles;

• procurement;

• financial transactions;

• valuable equipment.

Strong internal controls, background verification, employee screening and professional investigations should complement one another.

No single control eliminates internal risk.

Why Professional Polygraph Testing Matters

A polygraph examination involves considerably more than the equipment being used.

The quality of the examination depends on factors including:

• examiner competence;

• examination methodology;

• question formulation;

• case preparation;

• examination conditions;

• professional ethics;

• impartial interpretation;

• confidentiality.

Poorly conducted testing can create confusion rather than clarity.

For employers, the objective should therefore not be to obtain the result management wants.

The objective should be to obtain reliable, impartial information that helps management make better investigative decisions.

Dealing With Theft, Fraud or Dishonesty in Your Business?

If your organisation has experienced:

• stock theft;

• cash shortages;

• fraud;

• employee dishonesty;

• information leaks;

• suspected collusion;

• unexplained losses;

• workplace misconduct;

V3 Polygraph & Investigation Services can assist you in assessing the matter and determining whether polygraph examinations may be appropriate.

We provide professional, confidential and impartial polygraph services to businesses and private clients across South Africa.

Speak to V3

V3 Polygraph & Investigation Services

Call: 068 259 4114Website: www.v3polygraph.co.za

Contact V3 to discuss your matter confidentially and determine the most appropriate next step.

Important Disclaimer

Polygraph examinations are investigative tools and do not independently determine guilt or innocence. Results should be considered together with other available evidence and appropriate investigative, disciplinary and legal procedures. Employers remain responsible for ensuring that their actions comply with applicable South African labour and employment law. Independent legal or labour advice should be obtained where necessary.

Sources and Further Reading

• Commission for Conciliation, Mediation and Arbitration (CCMA), Polygraph Testing Information Sheet.

• Labour Relations Act 66 of 1995.

• Relevant South African Labour Court and Labour Appeal Court decisions concerning the evidential use of polygraph examinations.