At Delta Polygraph Services we do all types of Polygraph Examinations
Crime Incidents Examinations
Pre-employment Examinations
Periodical Examinations
Infidelity Examinations
Our Examiner Johan de Lange was trained in the most up-to-date Polygraph techniques at the International Polygraph Studies Centre. The trainers included, Mr. Raymond Nelson, who is one of the best if not the best persons, in Polygraph Examinations in the world. Also Mr. Rodolfo Prado, the President of the International Polygraph Studies Centre, who has been training people all over the world, including the United States, Mexico, Russia and Poland.
Johan has also been trained by the United States Department of State as a Special Investigator. Johan completed his training as a Special Investigator at the U.S. Diplomatic Security Training Centre in Washington DC. Johan worked as a Special Investigator at the U.S. Embassy in Pretoria and the U.S. Consulate in Sandton.
Johan was also a Detective in the South African Police Service for 20 years, where he investigated all types of crime.
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