Being that spewing bold faced lies in open court after swearing on a Bible is standard practice for anyone walking through the doors of a courtroom these days, it seems to me that the utilization of polygraph exams and machines certainly couldn't do any harm. I can't see how they could make a case worse in deference to the current climate of moral decrepitude. Certainly they should be standard equipment for all divorce and custody hearings.
Yes, it should be used. Certainly there are instances where the results might be skewed due to illness, drug use (legal or illegal), etc.
No it's a pseudo science. They shouldn't use them for investigative reasons either.
Even if they were proven, it would not be a good idea.
Nope, these tests are not trustworthy.
Such test are not 100% accurate. Having a false reading in the court room can greatly effect an uninformed jury, regardless of other evidence. Its like the CSI effect where jurors think that there is no actual proof of a crime unless DNA evidence is used.
No, because they are not accurate. Nerves will show you as lying, clenching your anus will show you as lying.