The Department of Homeland Security has administered lie detector tests to about 50 staffers in recent weeks, including FEMA’s acting administrator and roughly a dozen officials at the disaster relief agency, as part of an intensifying effort to root out what the department alleges are leaks of national security information.

“We are agnostic about your standing, tenure, political appointment, or status as a career civil servant — we will track down leakers and prosecute them to the fullest extent of the law,” DHS spokesperson Tricia McLaughlin said in an email to CNN.