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Lie Detection & Polygraph Testing Services

In today’s complex world, the need for reliable lie detection and polygraph testing has never been more critical.
Whether you’re an individual seeking to verify someone’s honesty, a legal team requiring corroborative evidence, or an employer ensuring workplace integrity, our specialised services in lie detection and polygraph testing offer invaluable peace of mind.

At John Vorster Private Investigators, we specialise in providing discreet, professional lie detection and polygraph testing services. Utilising state-of-the-art technology and highly trained experts, we offer you the assurance and evidence you require to make informed decisions.

Who Requires Lie Detection & Polygraph Testing Services?


Individuals: Those seeking to verify a person's honesty or integrity.


Legal Professionals:: Solicitors needing corroborative evidence for legal cases.


Employers: : Businesses ensuring workplace integrity and honesty.


Insurance Companies: : Firms requiring verification of claims or statements made by policyholders.

Types of Testing Services

Lie detection and polygraph testing aren't one-size-fits-all solutions. We offer a range of testing types to ensure you get the precise service you require.
Polygraph Testing:

Standard lie detection test involving physiological responses.

Voice Stress Analysis:

Assessing truthfulness through voice patterns.

Written Statement Analysis:

Standard lie detection test involving physiological responses.

Lie Detection & Polygraph Testing FAQ's

A: In South Africa, the cost of polygraph services typically ranges from R2,500 to R5,000 per test, depending on various factors.

A: Yes, an employee cannot be forced to submit to a polygraph test in South Africa. Refusal to do so does not indicate guilt and is not necessarily grounds for dismissal. Written consent is preferably obtained, and the employer should agree with the Polygraphists on the questions to be asked.

A: The estimated accuracy of a polygraph test in South Africa is 87%. That means in 87 out of 100 cases, the polygraph can accurately determine if someone is lying or telling the truth.

A: A typical polygraph examination in South Africa includes a pre-test phase, a chart collection phase, post-test phase, and a test analysis phase. This procedure usually takes one to one and a half hours.

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