"We ought not to have separate rules for separate people about polygraphs, we've got to stick with the structure," Dan Meyer said.

Polygraphs are frequently used in criminal investigations, but rarely used in court. How do polygraphs work? The idea behind the polygraph, which was first developed in the ‘20s, is that l ying causes ...

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 ...

Lie detector tests are often treated as truth machines, but they’re far from perfect. In this video, we explain how polygraphs work and why people sometimes pass them even when they shouldn’t. Rather ...

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 ...