Can a polygraph examiner manipulate a polygraph test to cause the subject to pass or fail a test?
Yes. They can manipulate it, but review of the test by other polygraph examiners would easily detect that there had been manipulation on the polygraph test and thus make the examiners credibility and the test in question invalid. The high standards of the polygraph profession would rapidly sensor any future work done by the polygraph examiner. Credibility of the polygraph subject would indeed be ruined at that point, so it defeats the purpose of any manipulation attempts.
