In a polygraph test monitors that are attached to the subject's body measure physical responses, and little pens attached to the monitors record the responses on a graph. The literal meaning of polygraph is "many writings". Guilty people who pass the test leave undetected. Those who favor polygraphs usage say that when people lie anxiety and fear of being caught cause involuntary changes in blood pressure and the way they breath and sweat. Critics say they have little credibility and that it is wrong to equate fear and distress with guilt. Hide Caption 8 of 11
In a polygraph test monitors that are attached to the subject's body measure physical responses, and little pens attached to the monitors record the responses on a graph. The literal meaning of polygraph is "many writings". Those who favor polygraphs usage say that when people lie anxiety and fear of being caught cause involuntary changes in blood pressure and the way they breath and sweat. Critics say they have little credibility and that it is wrong to equate fear and distress with guilt. Hide Caption 8 of 11