Nroug7: But what if you faltered and you believed that you were responsible for their death? A Truth/Lie test isn't based on facts, it's based on psychology.
XmXFLUXmX: What if's aren't important, the fact is that I would take the polygraph test, for the reason that it would prove that i'm at the very least, willing to take it to prove my innocence.
When somebody accused of a crime [who also claims innocence] has the chance to clear himself of charges, or at least prove that he can tell the truth on a polygraph test, refuses, it makes it look like the guy is a liar, and he's afraid of being exposed as one. He'd rather lie to people in court, than a machine out of court.
CaptainGyro: so...nothing then. OK.
XmXFLUXmX: Yes, the lack of innocent people in prison, is evidence to the fact, that there are very few if 0 innocent people in prison. You are asking to prove a negative, which is impossible.
But the what if's actually matter ALOT. You will quickly learn humanity tends to form social groups with particular beliefs and seeks certain knowledge, and will quickly deny anything that is contrary to that belief (See: Christianity and Charles Darwin)
What if he didn't want to take the test? What if he was a witch? What if he was a criminal? What if he believed that he was doing it for a cause.
Ultimately, the test depends on what you actually believe. Polygraph testing has been known to give incorrect readings
Read: sex scandal case in Australia, Teen girl claims sex scandal, has images of popular person.
Polygraph testing first shows that she was involved and reads true
2 months later she says it was a lie, the polygraph reads this as true.