When Kristi Noem isn’t donning various costumes to highlight how the Trump administration is deporting people indiscriminately, the Homeland Security secretary is keeping busy by ordering rampant lie-detector tests of her own staffers to root out leakers.

Polygraphs have long been used in various intelligence agencies, including DHS, for things like criminal investigations or security clearances. But their use at this scale and in this manner is unprecedented. The Wall Street Journal reported on Tuesday that under Noem’s direction, the tests........

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