polygraph

polygrafi A device which measures and records several physiological variables such as blood pressure, heart rate, respiration and skin conductivity while a series of questions is being asked to a subject, in an attempt to detect lies.
puhekieltä A mechanical instrument for multiplying copies of a writing, resembling multiple pantographs.
puhekieltä A collection of different works, either by one or several authors.
puhekieltä A group of letters that represent a single phoneme
To administer a polygraph test.

The FBI polygraphed the suspect but learned nothing because they already knew he was lying.