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.

The National Security Agency denied a top-secret clearance to David Vermette this year after two polygraph tests. But the computer programmer still has access to sensitive, classified information -- ...

Polygraph test results are also generally inadmissible in federal courts and in most state courts because of doubts about their reliability. Statements or admissions made by test subjects during a ...