One idea regularly kicked around Trump’s government-in-waiting is a dramatic increase in the use of “lie detectors” across the federal apparatus, to root out or charge leakers and other subversives. These devices, called polygraphs, are frequently unreliable and inadmissible in courts of law. Then-President Trump and his then-attorney general, Jeff Sessions, mulled expanded use of polygraphs during the first term, when leaks to the media were especially copious.