POLOKWANE – It is not easy to fool a person when they take a polygraph test.
The Polokwane Observer spoke to Polygraph tester Leon De Villiers about the four types of polygraph tests that can be requested.
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Leon has been in the South African Police Service and owned a security organisation. He has been an investigator for more than 40 years.
• Pre-employment screening – This screening uncovers things that are not always detected during an interview. These include a criminal record, drug or alcohol abuse and involvement in illegal activities. The test can help the employer appoint the best person for the specific post.”
• Periodic screening – This is used in an organisation where many people work and is a preventive measure. You test people at random and include questions like are you involved in illegalities or do you know of any one who is. It traces suspicious employees and strengthens trust in honest employees.
• Crime-spesific screening – This test is aimed at identifying the culprit and exclude the innocent. You can also verify a person’s truthfulness, regarding their honesty, by specifically focusing on his involvement or knowledge of a specific incident.”
• Infidelity screening – When a person suspects their partner is unfaithful, they can get a test done. The test requires direct questions.”
Read more about Leon and polygraph testing in the Polokwane Observer.