Polygraph and Lie Detector Testing in Cape Town

We provide a wide range of polygraph services, including:

Specific Issue Tests (e.g., theft or incident-related concerns)

Infidelity Examinations

Periodic Screening for businesses or individuals

Pre-Employment Screening

Yes, confidentiality is a top priority. All lie detector test results are handled with complete discretion, and your information is safeguarded throughout the entire process.

To prepare for a polygraph test, ensure you are well-rested and avoid excessive caffeine or alcohol beforehand, as these can affect your physiological responses. Dress comfortably and arrive on time to reduce stress. Be honest and transparent during the pre-test interview, as this helps establish a baseline for your responses. Familiarize yourself with the questions that will be asked, and mentally review the topics to stay calm and focused. Avoid overthinking or trying to manipulate the results, as this can lead to inconclusive outcomes. Lastly, approach the test with a clear mind and a cooperative attitude.

Polygraph tests are not 100% accurate and are often debated in the scientific community. They measure physiological responses like heart rate and sweating, which can indicate stress or deception. However, accuracy varies, with estimates ranging from 70% to 90%. False positives (innocent people flagged as deceptive) and false negatives (deceptive individuals passing) are possible, making them unreliable as standalone evidence.

Polygraph results are generally inadmissible in most courts due to their unreliability. However, they may be used in certain legal contexts, such as parole hearings or pre-employment screenings, with the consent of all parties. Their use is more common in investigative settings to gather information rather than as definitive proof of guilt or innocence.

The confidentiality of polygraph tests depends on the context and agreements in place. In legal or employment settings, results may be shared with relevant parties. However, ethical guidelines often require examiners to inform participants about who will have access to the results. Unauthorized disclosure of polygraph information is generally prohibited.

Polygraph tests typically include three types of questions: irrelevant (e.g., ‘Is today Monday?”), control (non-threatening but designed to elicit a response), and relevant (directly related to the issue being investigated). Questions are carefully crafted to avoid ambiguity and are reviewed with the examinee beforehand to ensure clarity and fairness.