While polygraph exams, which Noem pledged to use for department employees, are typically not admissible in court, they are used by federal law enforcement agencies and for national security clearances.

U.S. Department of Homeland Security Secretary Kristi Noem tapped Todd Lyons and Madison Sheahan to lead U.S. Immigration and Customs Enforcement.

Homeland Security Sec. Kristi Noem on Friday said her agency has identified two alleged "criminal leakers" who may have thwarted immigration raids.

Homeland Security Secretary Kristi Noem on Sunday announced new leadership at the agency tasked with immigration enforcement as she also pledged to step up lie detector tests on employees to identify those who may be leaking information about operations to the media.