PolygraphLieDetection: Used Limestone computerized polygraph instrument for sale in Northern California

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Mexico:
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Other Languages (Spanish, Russian, Korean, Chinese, Japanese, Hindi, Punjabi, etc):
http://www.polygraphnow.com/specialtypoly.htm

Learn Polygraph:
http://www.polygraphacademy.com/
Includes Federal Polygraph Academy training manuals plus all advanced topics; learn at home with the 50-pound-package!