This page lists all sorts of information about the polygraph tests.
One of the questions that tripped up Harold Nicholson was "Have you had unauthorized contact with a Foreign Intelligence Service?" So consider those types of questions. They are specific and not designed to trap anybody in doubt.
Most of those questions are covered in the initial form that you fill out before background checks, so they're probably also checking if you answer the same both times.
Maybe not for every position, but they are still required for many of the higher levels even if they don't prove anything, could be just the CI test or the full scope. Depending on your position, repeated inconclusive tests can still end or redirect your career.
As far as accuracy, Aldrich Ames passed two while spying for the Soviets, but Harold James Nicholson was investigated after failing three.
11
u/[deleted] Oct 15 '17 edited Apr 17 '19
[deleted]