Once the services of our firm have been retained, the examiner will have a meeting or a telephone conversation with the requester of the polygraph examination, also referred to as "the client". During this time, all case facts of the issue under investigation will be disclosed and discussed. The client must provide the examiner with solid information in this regard for it will serve as the foundation for the polygraph examination. The client must establish all case facts beforehand by way of a full and rigorous investigation.
A mutually agreed upon date and time for the polygraph examination will be set.
THE POLYGRAPH EXAMINATION
A polygraph examination consists of three distinct phases:
1) Pre-Test Phase (Information Collection);
2) In-Test Phase / Polygraph Examination (Chart Collection);
3) Post-Test Phase (Data Analysis).
1. PRE-TEST PHASE (Information Collection)
During this first phase the examiner will:
THE POLYGRAPH INSTRUMENT
The computerized polygraph instrument collects, measures, and records physiological data obtained from three major systems in the human body, all of which are controlled by the Autonomic Nervous System.
i) Cardiovascular System: Heart rate, relative blood pressure, blood volume;
ii) Respiratory System: Respiratory activity;
iii) Electrodermal System: Galvanic skin response, i.e., sweat gland activity.
Following the pre-test interview, the polygraph examiner will place various painless components on and around the examinee’s body, thereby connecting him or her to the polygraph instrument. These components are equipped with sensors that serve to collect the examinee’s physiological data as he or she answers the series of previously reviewed questions during the course of the polygraph examination.
A standard blood pressure cuff, applied to the examinee’s upper left arm for the purpose of
recording cardiovascular activity;
Two convoluted rubber tubes (called pneumographs), placed over the examinee’s chest and
abdomen to record respiratory activity;
Two small metal plates (called galvanometers), attached to the fingers of the examinee’s right hand to record sweat gland activity.
Before beginning the polygraph examination, the examiner will administer a calibration test. The purpose of this test is threefold:
i) To induce or to strengthen in the examinee the expectation that the polygraph can accurately
determine the truthfulness of his or her answers;
ii) To obtain adequate tracings of the examinee’s physiology to ensure that he or she is a suitable
candidate to undergo a polygraph examination;
iii) To confirm to the examiner that the polygraph instrument is in good working order at the time
of the polygraph examination.
2. IN-TEST PHASE / POLYGRAPH EXAMINATION (Chart Collection)
The polygraph examination takes place during this second phase. Just before beginning the examination, the blood pressure cuff will be inflated to a pressure of 60 mmHg. The examiner will then ask the examinee the series of questions that were formulated and reviewed during the pre-test interview. This series of questions will be asked a minimum of three times. As the examinee answers the questions, his or her physiological data are continuously collected, measured, and recorded by the polygraph instrument.
The examinee will have a relaxation period of approximately two minutes between each series of questions.
3. POST-TEST PHASE (Data Analysis)
During this last phase, the examiner will analyze and evaluate the physiological data by means of a numerical quantification system, and will render one of the following results:
No Deception Indicated: The examinee is telling the truth.
Deception Indicated: The examinee is not telling the truth.
Inconclusive: The evaluation of the examinee’s physiological data is inconclusive.
The examiner will give the examinee the result of the polygraph examination and discuss this result with him or her. If the physiological data recorded on the polygraph charts show reactions on the part of the examinee to one or more of the questions asked during the polygraph examination, he or she will be given the opportunity to explain these reactions.
POLYGRAPH EXAMINATION REPORT
Upon completion of the polygraph examination, the examiner will provide the client with a verbal report. A written report, detailing the information received during the polygraph procedure and the examination result, will follow in a timely manner.
SYSTEMS AND METHODOLOGY
All polygraph examinations are administered in accordance with the Code of Ethics and the set of Standards and Principles of Practice required by the American Polygraph Association and the Canadian Association of Police Polygraphists.
Our firm utilizes state-of-the-art computerized polygraph instrumentation and software developed by Limestone Technologies, Inc., and by Lafayette Instrument Company.