Yeah, nice smarmy ass response there. Sure, the machine detects things sweat production. Such lie, so detect! You can also get the same just be observing someone's body language, something that all detectives are taught to do.
Alternatively, the machine can produce false detections from something as simple as an itchy asshole. If the interview is conducted in an uncomfortable room, which is a psychological tactic often employed, that can also produce false detections as the person fidgets and reacts to the environment.
I wasnt making fun, I actually agree with you and not him(?). I just meant he(?) should stfu about things he(?) doesnt know anything about.