The polygraph is commonly used during criminal investigations to determine whether a suspect is telling the truth.
No it is not required.
No, the results of polygraph tests are inadmissible in court as evidence.Added: They can, however, be used by law enforcement as an aid to investigation.
Polygraph examiner
The polygraph test is not "proof-positive". The polygraph test is not completely unreliable.
parts of a polygraph machine
In most states, no. However, in some states they are allowed under certain circumstances. It's typically not within the trial judge's discretion when to and not to admit this evidence. Most states' appellate/supreme courts have set out rules in case law for when polygraph is admissible. For example, in several states, a polygraph is admissible in a criminal case when it is first introduced by the defendant, but the state may not be the first to introduce it. However, if the defendant introduces a polygraph test, the state may rebut that evidence with a conflicting exam.
Polygraph or 'lie detector' machines is a technology is that is still not generally liked or trusted technology. Trained, experienced people make a living from polygraph use is still hard. Talking with some who are already working in the field would be best able to help you
AHH a lie detector ANSWER by Engl1sh: A perfessional typically uses the term 'polygraph' test.
American Polygraph Association was created in 1966.
http://www.lie2me.net/thepolygraphmuseum/id16.html
I think you mean a polygraph test. Polygamy is the practice of having more than one spouse. A polygraph test is a lie-detector test. It depends on the laws, in some places you can use a polygraph test as part of a legal trial and in other places you can't.