Add Yahoo as a preferred source to see more of our stories on Google. American inventor John Larson, right, demonstrates the operation of a polygraph at Northwestern University in Evanston, Illinois, ...

The Federal Bureau of Investigation (FBI) has found itself embroiled in a rather odd situation involving polygraph tests. In April, it confirmed to NPR that it was using these tests to catch personnel ...

But the veteran came to the disturbing conclusion that “lie detectors” were a dangerous fraud, capable of convicting innocent people of crimes they knew nothing about. Feeling miserable and guilty, he ...

The science behind the lie detector test has been disputed since its creation 90 years ago, so is there any reliable way to tell if someone is lying, asks Dr Geoff Bunn, author of The Truth Machine: A ...

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 ...