Polygraph exams are commonly called "lie-detector tests" but experts say that's not true. The FBI and other agencies are using polygraphs to find leakers. But do they work? Federal agencies have ...

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 ...