Computer polygraphs

Started by nopolycop, Nov 05, 2007, 11:02 AM

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nopolycop

Nov 05, 2007, 11:02 AM
When a chart is made, does the computer calculate the number of beats per minute, the blood pressure, the breathing rate?  Is that displayed on the screen for the polygrapher to see?
"Although the degree of reliability of polygraph evidence may depend upon a variety of identifiable factors, there is simply no way to know in a particular case whether a polygraph examiner's Conclusion is accurate, because certain doubts and uncertainties plague even the best polygraph exams."  (Justice Clarence Thomas writing in United States v. Scheffer, 523 U.S. 303, 118 S.Ct. 1261, 140 L.Ed.2d 413, 1998.)

skip.webb

#1
Nov 05, 2007, 01:02 PM
One may calculate the heart rate and respiration rate by looking at the 5 second time markers on the polygraph chart. Simply count the beats in a 10 second interval and multiply by 6.  Same with respiration rate although a little longer interval is better.  Number of cycles in a 20 second interval multiply by 3.  Blood pressure is not given or calculated.

nopolycop

#2
Nov 05, 2007, 05:57 PM
Quote from: skip.webb on Nov 05, 2007, 01:02 PMOne may calculate the heart rate and respiration rate by looking at the 5 second time markers on the polygraph chart. Simply count the beats in a 10 second interval and multiply by 6.  Same with respiration rate although a little longer interval is better.  Number of cycles in a 20 second interval multiply by 3.  Blood pressure is not given or calculated.

Thank-you Mr. Webb.
"Although the degree of reliability of polygraph evidence may depend upon a variety of identifiable factors, there is simply no way to know in a particular case whether a polygraph examiner's Conclusion is accurate, because certain doubts and uncertainties plague even the best polygraph exams."  (Justice Clarence Thomas writing in United States v. Scheffer, 523 U.S. 303, 118 S.Ct. 1261, 140 L.Ed.2d 413, 1998.)
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