At the Homeland Security Department,
Secretary Kristi Noem pledged this month to step up lie detector tests on employees in an effort to identify those who may be leaking information about operations to the media.
While polygraph exams are typically not admissible in court proceedings, they are frequently used by federal law enforcement agencies and for national security clearances. In 1998, the
Supreme Court ruled they were also inadmissible in military justice proceedings.
They are inadmissible because they are unreliable and often result in false positives, said
George Maschke, a former Army interrogator and reserve intelligence officer who went on to found AntiPolygraph.org. Mashke failed a polygraph himself when applying to the FBI.
But they have been
intermittently used since the 1990s to intimidate and scare sources from talking to reporters, Maschke said. A 1999 Pentagon report said it was expanding the program to use polygraphs on defense personnel “if classified information they had access to has been leaked.”