The Department of Homeland Security has begun performing polygraph tests on employees to determine who might be leaking information to the media about immigration operations, according to four sources ...

At least six career staff were placed on leave after DHS opened an investigation into whether they misled the agency’s acting director, Madhu Gottumukkala, into taking the test.

Federal prosecutors seek to withdraw a plea deal made with disgraced South Carolina attorney Alex Murdaugh on the grounds that he allegedly lied during a polygraph test, therefore violating the terms ...

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 ...

Four sources say the Department of Homeland Security has begun performing polygraph tests on employees to determine who might be leaking information to the media about immigration operations. NBC News ...