[spiraldancing]

Lie detectors are a measure of heart rate, respiration, and galvanic skin response (roughly == how much you sweat).

What relationship—if any—those have to the truthfulness of a person at any given moment, remains debatable at best.

[sneak]

There is no “debatable”: no correlation exists. Anyone who claims otherwise has to prove otherwise, and nobody has ever done so.

No correlation exists.

[spiraldancing]

And yet we appear to be debating.