Lie detectors are not admissible in court, and I imagine no witness would agree to take one and I doubt it could be compelled.
They are supposed to tell the story as they believe it truthfully to be, and then it is for the jury (or judge) to decide if they are truthful.
no they are pretty much uniformly inadmissible. They are easy to manipulate, easy to create a false reliance.
The older tests could be manipulated with a simple thumbtack between the toes. It is akin to the false memory creation of psych interviewers.
Josie’s comments on the Dana Loesch show are inadmissible, too, but people are taking stock in what she said, even though it is hearsay.
A polygraph test can be administered before going to trial, and isn’t hearsay, either.