It was obviously a form of lie-detector—and Korvin felt himself marveling again at this race.
He examined the indicators of the lie-detector with great care.
They needed no words; the lie-detector was telling them, perfectly obviously, that he was speaking the truth.
The Ruler flashed a look at the technicians handling the lie-detector.
Korvin's guards were standing around doing nothing of importance now that their captor was strapped down in the lie-detector.
lie detector n.
A polygraph used to detect possible deception during an interrogation.