What if you're being recruited for a counterintelligence job for a 3-letter agency and part of the job definition is being intimately familiar with the details

What if you're being recruited for a counterintelligence job for a 3-letter agency and part of the job definition is being intimately familiar with the details of how persons might attempt to beat a polygraph? That's definitely something a person in that specific field would spend a good deal of time studying. I guess this is sort of a chicken/egg problem since you can't or won't get hired for the job if you appear too familiar with the workings of the recruitment process. But then if you don't get hired, they might be leaving out one of the better informed candidates. Anecdotally from the defense contractor industry I've known a number of people who have a whole bookshelf of books on subjects like cold war era espionage, are deeply familiar with some of the most noteworthy moles/spies that were publicly prosecuted and jailed (or north korean, chinese, soviet officers and officials who were just straight out executed with a bullet to the back of the head). It didn't seem to prevent any of them from passing their clearances. Some jobs want to know that you're motivated to learn the subject matter at hand and research its past 60+ years of history.