If at any time or for any reason, the examinee feels uncomfortable with the examiner, the examination should be stopped. Arrangements should be made for another examiner to conduct the test at another time. The examinee is attached to the polygraph instrument and given additional instructions. The questions are read to the examinee three times while they are attached to the polygraph instrument using sensors that measure blood pressure, heart rate, breathing and sweat gland activity.
These measurements are charted on graphs or stored in the memory of computerized polygraph units. Upon completion of the questions, the examiner will analyze the charts and numerically score the charts to make sure that his analysis is within the acceptable limits of the instrument. This score results in a conclusion that the examinee has answered either truth, deception or is determined to be inconclusive.
The examiner will transmit the test results to the client verbally as soon as is practical. A written report will be provided if requested. NOTE: Polygraph exams are conducted in private. No other persons are allowed in the examination room during the test. Exceptions may be made if an examinee requires an interpreter. Most reputable examiners videotape the examination for the protection of all parties involved. A standard polygraph records changes in physiological signs. These signs include blood pressure, heart rate, breathing, and sweat gland activity galvanic skin reflex.
It does not matter that the examinee is nervous during testing; some nervousness is to be expected. An examinee intending deception when answering a particular question activates their sympathetic nervous system when that question is asked.
This will cause identifiable changes in one or more of the physical responses that is measured by the polygraph.
The test questions must have definite objective answers and may not be opinions. The test questions must relate to past events of a factual nature. The wording of the questions must only have one interpretation.
There are never any questions pertaining to religion or politics. There will be no questions pertaining to sexual subject matter during either the interview or polygraph examination unless such subject matter is relevant or necessary to conduct the investigation.
Questions in the same test must be related to one another. The examiner can ask about drug use and alcohol use in the same examination, but not ask about drug use and extramarital sex in the same test. Distinctly separate types of issues require separate examinations. This website uses cookies. You consent to our cookies if you continue to use our website. Below you can choose which kind of cookies you allow on this website.
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You will still see some advertising, regardless of your selection. Because we do not track you across different devices, browsers and GEMG properties, your selection will take effect only on this browser, this device and this website. Skip to Content. Leadership Voices Podcasts. Events About Newsletters. Featured eBooks. Lindy Kyzer December 10, By Lindy Kyzer. A full-scope polygraph combines the questions of both the CI and lifestyle polygraph. Follow your usual routine.
Share This:. Register for a free account to start saving and receiving special member only perks. Questioning techniques may differ in the nature of the comparison questions, the sequencing of questions, or the choice of which comparison questions in a sequence of questions will be compared with which relevant questions. They are also typically associated with particular approaches to conducting pretest interviews and interpreting polygraph charts. This appendix briefly describes some of the main polygraph questioning techniques and some of their variants.
All polygraph testing techniques normally begin with a pretest interview. The examiner also observes the behavior of the examinee and, in test formats that allow for discretion in question design, may gather information to be used in choosing comparison questions for the test. Depending on the complexity of the case, examiner-examinee interactions, and testing technique, the pretest interview may last from 30 minutes to 2 hours or longer Krapohl and Sturm, As its name implies, the relevant-irrelevant test format compares examinee responses to relevant and irrelevant questions.
A relevant question is one that deals with the real issue of concern to the investigation. These questions include asking whether the examinee perpetrated the target act or knows who did it and perhaps questions about particular pieces of evidence that would incriminate the guilty person. An irrelevant question is one designed to provoke no emotion e. Irrelevant questions are typically placed in the first position of a question list because the physiological responses that follow the presentation of the first question are presumed to have no diagnostic value; they are also placed at other points in the question sequence.
Guilty examinees are expected to show stronger reactions to relevant than to irrelevant questions; innocent examinees are expected to react similarly to both question types. The relevant-irrelevant test format was the first widely used polygraph testing format and was long the dominant format.
The format was originally used in criminal testing. Currently, it is also used in multiple-issue screening applications, for example, at the U. National Security Agency. Relevant-irrelevant polygraph tests are not normally standardized for question selection or for interpretation. Examiners typically interpret the test results globally by inspecting the charts to see whether or not there is a pattern of stronger responses to relevant questions. The lack of standard procedures for administration and scoring makes the relevant-irrelevant test unsuitable for scientific evaluation.
It is not possible to support general conclusions about its accuracy because the procedure can vary uncontrollably across examiners and examinations. Polygraph researchers generally consider the test outmoded. Relevant questions are defined as in the relevant-irrelevant test. Comparison questions ask about general undesirable acts, sometimes of the type of an event under investigation.
Innocent examinees are expected to experience concern about these answers that shows in their physiological responses.
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