Forensic, Clinical, and Personal Polygraph Examinations

Serving Michigan and Surrounding Areas



  • The polygraph is an instrument that detects and records internal physiological changes. It measures respiratory activity, electrodermal activity (EDA), and cardiovascular (blood volume) activity. When an individual lies, the human fight/flight/freeze response engages and physiological changes occur.

  • The length of a polygraph examination depends on many factors. The complexity of the issue under investigation, and the level of the examinee cooperation are factors that affect the duration of an interview. Individuals scheduled for an exam should plan on approximately two hours.

  • Most people are suitable candidates for examination. Physical factors that may prevent examination include pregnancy over 14 weeks or 100 days, recent major surgery, paralysis, severe cold and respiratory problems. Juvenile subjects under the age of 14 are often difficult to examine due to a lack of maturity. On occasion, psychological problems may prevent examination.

  • Any prescribed medication taken on a regular scheduled basis should be taken. If you have any questions, contact the examiner.

  • The polygraph has been shown to be up to 98% accurate. Results from a polygraph will be Deception Indicated (DI), No Deception Indicated (NDI) or Inconclusive/no opinion (INC or NO). While most cases will be determined during the polygraph, sometimes an examination will be inconclusive. This means no opinion is rendered as to deception or truth.

  • All examinees have some type of general nervous tension and may feel guilty about taking a polygraph exam. During the pretest phase, the examiner will review all elements of the examination and review the test questions with the subject prior to administering the examination. By this time, the innocent examinee will be a bit more relaxed. Nervousness will not cause an innocent examinee to be shown as deceptive.

  • Studies show there is nothing a person can deliberately and consciously do to cause a diagnostic error if the examiner is qualified and follows proper procedures.

  • Yes. There are no surprises on a polygraph. Every question will be reviewed prior to you being attached to the equipment.

  • The American Polygraph Association (APA) requires examiners who conduct Post-Conviction Sex Offender Testing (PCSOT) to be certified. If you have been convicted or are under investigation for a sex crime, you should choose a PSCOT certified examiner who has additional training for this type of exam.

  • Yes, in most cases. After the examination, the examinee will usually be given a verbal confirmation of the outcome. A written report will follow if requested.

  • Assure they are licensed and insured. Also, assure they belong to professional organizations and attend continuing education. If you are looking for an examiner to test on a sexual issue, assure they are PSCOT certified by the APA.

  • Follow this link to learn about the complete polygraph examination process.

  • You can learn more about polygraph on the following web pages:

    The Polygraph Place

    American Polygraph Association