I do not know nor pretend to know where ground truth lies with regard to this thread’s story.  That having been said, I do believe that neither my former colleagues in the FBI nor anyone else involved with polygraphy can reliably and accurately identify countermeasure application as would be confronted in commonly utilized polygraph screening exams.  Because of that and their (FBI Polygraph Examiner's) likely and correct realization that someone is using such countermeasures somewhere at sometime, I do think it probable that some wild guessing leading to wrongful accusation(s) of countermeasure usage is most likely occurring.  

On a more fundamental level though, I do believe that one or more of those examiners possesses the requisite grain of sense to realize that polygraph screening does not work as intended, is a veritable disaster, and should be discontinued.  What I am left wondering though is whether there are one or more such individuals who also possess the fortitude to buck the system and risk the consequences of telling the emperor that he is naked when it comes to such matters…