How accurate is a polygraph?
http://www.truthorlie.com/accurate.html
Physiological Arousal to an applied stimulus:
Heat Rate/ Blood Volume
Sweat Gland Activity
Respiration or Breathing
How to detect lies:
http://www.wikihow.com/Detect-Lies
Can drugs effect a polygraph test?
http://effectofdrugsonpolygraph.blogspot.com/
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