Unfortunately, people with far better credentials have been traitors and spies. Kim Philby, Aldrich Ames, and Robert Hanssen come to mind. IIRC, at least one was even given a pass on his polygraph test because of his credentials. Recently, Michael Flynn was a Lt General, head of the Defense Intelligence Agency, and National Security Advisor (to be clear, he is convicted only of lying to the FBI, AFAIK).
EDIT: Added to Flynn's credentials
> tells me I'm being deceptive and obviously support jihadi terrorism. This as I'm getting ready to leave on my 12th deployment.
> Three years later, at the start of his career as a Russian mole, Aldrich Ames passed a Central Intelligence Agency lie detector test. In 1991, he passed another, even though he was on the agency's list of suspected moles and living at a level far above his $70,000 Government salary. Last summer, Dennis DeConcini, then chairman of the Senate Intelligence Committee, visited Mr. Ames in jail and asked how he passed the exams. "Well," Mr. Ames replied, "they don't work."
https://www.nytimes.com/1995/02/19/opinion/lie-detectors-lie...
He also wrote a very interesting letter about polygraph testing:
Why was Ames given a pass on the other signs of risk? Because of his credentials?
But if I recall correctly, he was also surprised it took so long.
- I'm sorry, what did you say? I didn't hear that? ...
- Oh, I thought you said that. What made you say it? ...
- You know that people reserve the worst criticism for themselves? ...
Did my original question implied polygraph tests in any way?