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 ...

A recent polygraph test taken in Orange County, Calif., has brought the validity of polygraphs — also called “lie detector tests” — into question. Even though some police departments and ...

In terms of catching spies, polygraph tests failed spectacularly in key moments. More on that in a moment. First, consider the second Trump administration, which is leaning in on polygraphs, ...