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  • Fear of deception will cause physiological changes to occur on, or within the body of the subject, at or near the point of deception
  • These physiological changes can be diagnosed by a professionally trained forensic psychophysiologist (polygraph examiner)
  • An instrument that records continuously, visually, permanently and simultaneously, changes in cardiovascular, respiratory electrodermal and or pulse patterns, as minimum instrumentation standards
  • It is used, or the results of which are used, for the purpose of rendering a diagnostic opinion regarding the indication of deception or no deception of an individual
  • Polygraph examinations are admissible at the CCMA and in court and is used as corroborative evidence in misconduct and or crime


  • If you feel that you have been unfairly treated by a polygraph examiner or you believe the result of a polygraph exam is not correct, then contact me to scrutinise the complete examination and establish if the polygraph examination was done correctly. Alternatively I can give you the information you require to fight the case in the CCMA or in court if the examination process was flawed and not administered correctly
  • My analysis could ensure you have a watertight case at the CCMA or in the courts
  • All polygraph examiners must conduct tests ethically and in line with any of the rules and code of ethics of the following organisations, American Polygraph Association (APA), South Africa Professional Polygraph Association (SAPPA) and Southern Africa Polygraph Federation (SAPFED)
  • Les Peterson Forensic Services offers this service


  • The main steps in forensics analytics are
    • Data collection
    • Data preparation
    • Data analysis
    • Reporting
  • Accounting skills are used to conduct an examination into a company’s or an individuals’ financial affairs. For example, forensic analytics may be used to review if an employee has fraudulently taken any company money for personal use.
  • A forensic audit is the practice of lawfully establishing evidence and facts that are to be presented in a court of law
  • While forensic consultants usually do not provide opinions, the work performed and reports issued will often provide answers to the how, where, what, why and who
  • On completion of a forensic analysis, it is important to put safeguards in place to avoid similar occurrences happening in the future. Assistance with establishing proper policies, procedures and systems, to handle company assets in the future
  • Analysing financial policies and procedures
  • Setting new policies and procedures as a result of fraud, theft and corruption
  • Negotiating settlements and contracts on behalf of corporates
  • Interviewing and negotiating with perpetrators
  • Preparing documents and argument in civil/commercial cases on behalf of corporates
  • Working very closely with lawyers and advocates in civil/commercial matters
  • Surveillance



  • Fingerprints are electronically scanned and submitted in an effort to check if the candidate has a criminal record
  • Permission is received from the candidate to use his/her fingerprints in whatever manner deemed necessary for any type of verification
  • Background screening assists an employer to ascertain any important information about the employee or potential employee
  • Background screening includes, but is not limited to:
    • Criminal check
    • Credit check
    • ID verification
    • Matric qualification
    • Institution verification
    • PSIRA verification
    • Drivers license verification
    • Deed search
    • CIPC search
    • Sequestration



  • I am certified to collect mouth swabs and or urine samples for the purpose of establishing if a person has ingested any drugs within a certain period of time
  • A swab is taken from inside the mouth of the person
  • This swab will immediately identify if the person has any traces of illegal drugs (within certain categories) and or excessive use of certain prescription drugs which could possibly affect his/her ability to execute their duties effectively and efficiently



2A. (1)(2) an employer or a user as the case may be, shall not permit any person who is, or who appears to be under the influence of intoxicating liquor or drugs, TO ENTER or remain at the workplace




Every employee shall at work – Carry out any lawful order given to him, and obey the health and safety rules and procedures laid down by his employer or by anyone authorised thereto by his employer. We therefore would state that a person, who refuses to be tested, has not complied with South African OHS law. They refused the opportunity to prove their innocence. The refusal to be tested shall be taken as an admission of guilt


  • The following information is imperative to assist a client and or examinee in getting a quality polygraph result that has a greater chance of being accepted as evidence in court and the CCMA. It is important that proper care be taken when employing the services of a polygraph examiner, who has the correct credentials
  • Polygraph is all about truthfulness and ethics on the part of the examinee and the examiner
  • When considering using the services of a polygraph examiner the following are the minimum requirements that must be considered when contracting a polygraph examiner to do polygraph tests
  • It is irrelevant as to how long the “examiner” has been in the SAPS or how long he/she has been an investigator, this does not make them a competent polygraph examiner
  • A good, honest, ethical polygraph examiner will comply with all the rules and regulations pertaining to polygraph examinations, thus protecting the examiner, customer and or the examinee in the event of a case going to the CCMA or court
  • A polygraph examiner shall not knowingly make, publish, or cause to be published, any false or misleading statements or advertisements relating to his/her services, credentials and or the polygraph profession
  • No polygraph examiner shall make any false representation as to their credentials, their licensure, and their certification status
  • A polygraph examiner must advertise his/her services in an honest and ethical manner

Request the following documents and information from the Polygraph examiner


  • Qualification certificate
  • The polygraph examiner should furnish you where they received their polygraph qualification and the year completed
  • The most generally recognised training institutions are American International Institute of Polygraph and Nate Gordon – Academy for Scientific and Investigative Training, which are both recognised and approved/accredited by the American Polygraph Association (APA)
  • A polygraph course takes a minimum of 10 continuous weeks to complete
  • Membership certificate
  • The polygraph examiner should be a current member of at least one of the following reputable organisations. Request a current annual membership certificate. If a certificate is not immediately available, the organisation will reflect the polygraph examiners current membership on their website
  • Alternatively send an email to the organisation requesting the polygraph examiners membership status
  • A polygraph examiner may not conduct tests under the membership number of any other examiner
  • The Examiner should be personally registered with any of the below mentioned organisations:

American Polygraph Association (APA) (WWW.polygraph.org) (manager@polygraph.org)

Southern African Polygraph Federation (SAPFED) (WWW.sapfed.org) (admin@lietech.co.za)

South African Professional Polygraph Association. (WWW.polygraph.org.za) (admin@polygraph.org.za)

  • Functionality test certificate
  • A functionality test must be conducted on all polygraph equipment at least every six months; this will ensure that the examiners equipment is in good working order
  • An equipment functionality certificate will be issued by any of the 2 accredited organisations in South Africa, namely. Southern African Polygraph Federation (SAPFED) and the South African Professional Polygraph Association (SAPPA)
  • Continuous training
  • All professional polygraph examiners are required to do a minimum of 30 hours of continuous training over a period of 24 months

This training is normally done through the abovementioned polygraph organisations and is necessary to keep polygraph examiners up to date with the latest scientific research and technology pertinent to the polygraph industry

General information

  • All polygraph tests must be conducted in camera (including the pre-test interview)
  • The rule of thumb is that a “specific issue” and a “pre-employment” test will take at least 2 hours to conduct if all testing conditions are optimal
  • A polygraph test could take a lot longer, depending on the complexity of the specific issue at hand and any language barriers
  • A competent polygraph examiner will normally not be able to do more than 4 (four) to 5 (five) acceptable tests per day
  • Under no circumstances is a polygraph examiner permitted to test more than one person at a time. This includes the pre-test interview, the actual test phase and the post-test. It is highly unethical to conduct any part of a polygraph test with more than one examinee at a time
  • If a polygraph examiner does not comply with any of the abovementioned requirements, the test could be deemed, null and void and will more than likely not be accepted in the CCMA and or court
  • All test questions must be explained to the examinee in detail and the examiner must be sure that the examinee understands all the questions clearly before conducting the test
  • The examinee must sign a consent form before the test can be conducted. The examiner must ensure that the examinee understands the content of the form fully
  • It is prudent for an employer to insert a paragraph in an employee’s letter of appointment, spelling out very clearly that the employer has the right to conduct a polygraph test on the employee when necessary
  • Voice stress analysis is not polygraph; it is in no way related to polygraph in any form or manner. A polygraph system has at least 3 components monitoring physiological changes which are deemed to be more accurate. Voice stress analysis only relies on one component. The inventor of voice stress analysis is known to have been dishonest about his qualifications

If you are ready to employ a Professional Polygraph Service. You came to the right place. We are here to serve you.