Can a polygraph use in court?

Very rarely, as Polygraphs (Popularily called Lie-detectors) are generally not permissable as Court evidence. It is conceivable scertain types of cases such as those involving memory loss following violent accidents (crashes which may have killed other people, hence vehicular homicides) might be an exception to the rule and possibly identity-missing persons cases and legal proceedings involving illegal aliens and displaced persons. it is known they WERE employed by the KGB in many phases of the Anastasia case and a relative of mine knew a Russian psychiatrist who conducted these tests-after having been(seconded) By the Moscow Field office as a (Police Psychiatrist) shrinks who were on call in general hospitals were frequently called-upfor forensic(crime solving) work by the KGB. But that"s Russia! in the US iot is very rare for any court-ordered use unless possibly memory-loss cases involving accidents, as mentioned above or foreign language cases where the subject is not a U.S. Citizen! a very interesting question, with some technical advice by a Dr.Viktor Bubovsky if he is still alive! He conducted tests on a (Stacy) claimant in the late fifties.