APA ACCREDITED Polygraph Examiners

The Truth, Verified By Science.

Confidential polygraph testing for any business, HR / CCMA & legal, hospitality, retail, security, transport, warehousing, private family matters and pre employment screening / crim check vetting. Every examination is conducted by certified APA trained polygraph professionals using calibrated instrumentation & professional APA std's, ethics & protocols.

Contact UsOur Services
23+Years doing polygraph 
35,000+TOTAL tests Conducted
1800+DIFFERENT CLIENTS SINCE 2004
50,000+HOURS DOING POLYGRAPH TESTS
Professional investigator reviewing confidential case documentation in a modern office
What We OFFER

Our Services & Costs

 We deliver defensible results backed by scientific accuracy. From pre-employment screening to corporate investigations, random tests needed as part of contracts (mines and security industry), Cash in Transit , retail, warehousing etc, legal and police requested testing, CCMA and HR hearing expert witness testimony.We offer of the best rates in Cape Town for tests and travel. Discounts for bulk or regular testing. We work weekend and after hours if requested.


 *PLEASE CONTACT US FOR A QUOTE*

HR & CCMA-Admissible Testing

Polygraph examinations prepared for HR departments, arbitration and regulatory hearings. We are expert witnesses in these procedures and can advise on best practice how and when to use polygraph evidence.

Pre-Employment Screening

Discreet integrity screening for hospitality, financial and security-sensitive roles. Reduce hiring risk with objective, defensible results. Know who you are getting before employment starts. We can also help with criminal record checks / vetting. 

Corporate Theft Investigations

Examinations following stock or financial loss, internal fraud or syndicates. We work alongside your management and HR team to test the right people and gather evidence to prove balance of probability and possible breach of trust. We have 33+ years working as forensic investigators.

Private & Domestic Matters

Confidential examinations for personal disputes, false accusations, theft and family matters. 

Infidelity & Relationship Testing

Sensitive, non-judgemental testing designed to resolve doubt with clarity. Our examiners are trained in trauma interviewing and emotional de-escalation.

Vetting / screening checks

We are agents to do personal vetting and background checks for pre employment and personal needs. 

Close-up of calibrated polygraph examination equipment and monitoring instruments
Our Story

Two decades of forensic credibility

Our head examiner Marc started his working career working for the Military at the Airborne Unit - 44 Parachute Brigade. After his service he joined the world's leading diamond mining company De Beers Marine where he worked 10 years as a Criminal Investigator and Data Analyst. In 2004 he qualified at the American International Institute of Polygraph (AIIP).

He started the company Polygraph Truth Investigations with his father Ian that qualified in 2005. Marc ran the company with other additional examiners until 2021. During Covid Marc moved over to the UK to assist with various programmes. He qualified at PEAK in the USA to conduct tests on Post Conviction Sex Offenders which is a massive government and parole board programme in the UK. He was one of only 3 private examiners in the UK trained and certified to do this testing. He left UK in late 2026 to return to the UK where his farther Ian had been running the business until passing away in 2025. He had done over 13 000 tests by that stage. Marc has done nearly 20 000 tests in his career.

Marc has 2 decades of experience in hearings for companies and CCMA with some ground breaking rulings. He has done over 25 advanced polygraph courses, been to the USA many times for training and worked internationally as a consultant, examiner and trainer. 

2004COMPANY Established
95%+VALIDATED POLYGRAPH ACCURACY
1800+COMPANY CLIENTS
33+ YEARS FORENSIC INVESTIGATIONS 
How It Works

The Science of Polygraph

A polygraph is a diagnostic instrument used by a trained and skilled examiner for the purpose of collecting. measuring and recording selected physiological data obtained from an examinee as he or she answer a series of questions relating to specific issue. This data is then analysed and evaluated.Polygraph test data is a combination of physiological proxies that have been shown to vary significantly in response to different types of test questions as a function of deception and truth telling. Test results are probabilistic descriptions of a margin of uncertainty or level of confidence surrounding a categorical conslusion.The analytic theory of polygraph is that the greater changes in physiological activity are loaded at different types of test stimuli of deception and truth telling in response to relevant target stimuli.The polygraph instrument records data from sensors that measure autonomic and physical activity, including respiration, cardiovascular, electrodermal and somatic activity, in response to the stimulus questions. Several measurable responses have been shown to be statistically correlated with the differences in the strength of responses to lies and truth telling. To determine results a numerical score is assigned to these responses based in a structural model. The result is based on this data indicating either deception or truth telling. A polygraph is for convenience referred to as a lie detector. The test process is as follows:

01

Confidential Intake

A private consultation to build rapport, define the specific issue, establish the questions and confirm parameters before any testing begins.

02

Pre-Test Interview

The examiner explains the polygraph procedure, science and accuracy. A statement about the issue at hand is taken. Then reviews all questions with the subject.

03

Instrumented Examination

Computerised polygraph recording captures cardiovascular, respiratory and electrodermal activity across a controlled question sequence.

04

Scoring & Report

Numerical scoring, independent peer review and a written report issued the same day. It may be possible to give a verbal indication of the results to the client after the tests. 

HOW DOES POLYGRAPH WORK

FAQ

Here are some of the general questions and enquiries we have regarding the accuracy, reliability and legality of a polygraph test in South Africa. There are many worries that nervousness may effect the test or some medical issue. Polygraph is rated from 95% accurate according to decades of scientific research by the APA. The science is there, but its important that the examiner is trained, skilled, uses the right technique and runs the correct questions and enough charts to gather the required data to score. 

How accurate is a polygraph test?

Decades of scientific research by the American Polygraph Association rate polygraph accuracy at around 95% when the test is properly conducted. Accuracy depends heavily on a trained, skilled examiner using the correct technique, well-formulated questions and enough charts to gather reliable data.

Will nervousness affect my results?

Nervousness does not cause a person to fail. A skilled examiner establishes a baseline during the pre-test interview and uses comparison base line questions to distinguish genuine nervousness from the physiological responses associated with deception to the relevant questions, asked to a series of chart sequences.

Can a medical condition affect the test?

Always consult a medical professional before doing a test if you think a condition or medication can effect the test. If you are living a day to day normal life on meds, you drive a car, go to work and function normally, there is no reason you cant sit and say yes or no to questions. This will not only effect relevant questions asked when we also do multiple baseline ques. 

Is polygraph testing legal in South Africa?

Yes. Polygraph testing is legal in South Africa and is widely used by employers, private individuals and investigators. Results are generally used as a supporting investigative tool rather than as sole evidence in a court of law. There are hundreds of case examples of use in CCMA  and arbitration cases. Polygraph can be added in employment contracts too.

How long does a polygraph test take?

A typical examination takes around 1h30+. This includes the pre-test interview, the recording of the charts. Scoring and quality control is done after this process before the report is written and sent to the client. 

Can I be forced to take a polygraph test?

No. Participation is voluntary and requires your written consent. You may decline a test, though an employer may draw their own conclusions from a refusal in certain circumstances. Some employment contracts have conditions for staff to do pre employment, screening or incident related tests if required based on trust in the workplace and duties.

Voice Stress vs Polygraph?

Please do not be tricked by 'a voice polygraph' being better or more accurate than a polygraph. This is their marketing. All independent scientific studies show it in the range of 47-54% accurate. Polygraph is up to 2hrs of data collection vs voice stress often done in minutes over the phone. The APA website has all the science available to read on this matter. 

Can I take medication before a test?

Do not stop prescribed medication without consulting your doctor. Simply inform the examiner of everything you are taking so the results can be interpreted correctly and any impact on the readings accounted for.

Are the results confidential?

Yes. All examinations and reports are treated as strictly confidential. Results are released only to the person who commissioned the test, or to others with the examinee's written consent.

Get In Touch

Contact us

+27 72 269 1317
polygraph@iafrica.com
Testing throughout South Africa at client premises

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