(2) Galvanograph Component. The Galvanic Skin Reflex (GSR) is measured by
attaching a set of electrodes to the surface of the hand, or to the fingers of the
hand. By means of the passage of an imperceptible electrical current through the
hand or fingers bearing the electrodes, the galvanograph unit records the
variations in the flow of the electrical current.
(3) Cardio-sphygmograph Component. A blood pressure cuff, or the type used
by physicians, is fastened around one of the examinee's arms.
When cuff is
inflated, it monitors changes in the mean blood pressure and heart rate.
The
impulses are received from the examinee's arm through the cuff and tubing, past a
sphygmomanometer (pressure recording device) to a sensitive bellows system that
operates another recording pen. Heart pulsations also appear on their part of the
chart recordings. Sometimes the pulse signal is split to a second electronically
enhanced recording unit.
(4) Kymograph Component.
This component moves the chart paper at a timed
rate of speed, 6 inches a minute on present instruments, so that the blood-pulse
pressure, respiration, and GSR can be continuously recorded all at one time.
c. Polygraph records will usually permit a competent examiner to draw
a
reliable conclusion about the examinee's truth or deception.
5.
Authorization of a Polygraph Examination.
a. A polygraph examination
cannot
be
conducted
without
authorization
as
designated by AR 195-6.
b. The agency requesting authorization for a polygraph test submits, to the
authorizing representative, an electrical message for approval prior to the conduct
of the test.
In the event message facilities are not available a DA Form 2805
(Polygraph Examination Authorization) may be used.
c. The authorizing representative will make a decision, and so indicate on a
return message to the requestor.
d. The request must indicate that:
(1) The investigation by other means has been as thorough as possible.
The
development of more information by means of a polygraph test are essential.
(2) The offense for which the request is submitted is punishable under the
Manual for Courts-Martial for a term of one year or more.
(3) The person to be tested has been interviewed under rights advisement.
There is reasonable cause to believe that he has criminal involvement and/or
knowledge in the matter under investigation.
That the person to be examined has
consented to a polygraph examination.
MP1016
4-4
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