A gadget that lies between sorcery and science
Polygraphs are capable of exonerating the guilty and framing the innocent, writes Anjana Ahuja
http://www.ft.com/intl/cms/s/0/2ebf155a-c722-11e4-9e34-00144feab7de.html#axzz3UFJSUYjK
Here's another good article:
http://www.mortontavel.com/2015/03/02/polygraph-lie-detector-test-biggest-lie/comment-page-1/#comment-34650