Previously, per Zaid, polygraphs have been used as a sort of “weeding device,” not unlike a physical fitness test for large pools of applicants to national security and law enforcement roles. After ...

Federal agencies have stepped up their efforts over the past few weeks to find potential leakers, and some — like the FBI, the Department of Homeland Security and the Department of Defense — are ...

The polygraph is not a lie detector but rather an instrument that measures a person’s physiological changes to questions posed by the examiner. An elevated physiological response to a particular ...

"Don't you dare tell a lie in there," my father admonished as I was about to enter the confessional for the first time. He warned that if I did, the priest would push a little button, the floor of the ...

A version of this story appeared in CNN’s What Matters newsletter. To get it in your inbox, sign up for free here. When President Ronald Reagan’s White House threatened thousands of government ...