I can beat any polygraph.
FBI and DIA agree.
And I am not a sociopath or psychopath.
I have been trained to control galvanic skin response, and Zen which allows substantial control over heart rate and respiration.
Oddly, it was not government training, but something I picked up at the local community college.
Galvanic is easy to beat, just tell the examiner you are diabetic and they have to disallow it.
A crafty examiner reinserts control questions along the way. Expected false questions that are often repeated are hard to reset for and give the same response to.
Again it is always highly subjective.