I don't think the lying to suspects or tricking them into confessing is inherently wrong (within reason of course, a good waterboarding will get anyone to confess just about anything they didn't actually do).
The problem with lie detectors though of course is people thinking they're anything but a gimmick used in tricking gullible suspects.
The fact that they seem very prevalent in security clearance is quite alarming, I suspect security clearance does not assume to be attempting to trick gullible applicants.
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