FBI Director Kash Patel is making bureau staff take polygraph tests to root out anyone who’s been talking trash about him, according to a report. Patel has ramped up the FBI’s use of the lie-detector tests—often deemed too unreliable to use as evidence in criminal courts—in order to keep tabs on his own people and stamp out leaks.

FBI head Kash Patel has reportedly pointed to his frustrations with Attorney General Pam Bondi, especially over the contentious Epstein files issue