Polygraph tests are not usually acceptable as evidence in court.
HOWEVER. Law enforcement can still use them as another tool in their questioning process to produce a confession when there is other evidence pointing to the guilt of the suspect. But of course is only effective against defendants who represent themselves, don't seek their lawyer's advice, or ignore their lawyer's advice.
HOWEVER. Law enforcement can still use them as another tool in their questioning process to produce a confession when there is other evidence pointing to the guilt of the suspect. But of course is only effective against defendants who represent themselves, don't seek their lawyer's advice, or ignore their lawyer's advice.