About 16 years ago, I applied for the CIA. It was the most violating process of my freedom that I've ever been through - even greater than my time in the military. The CIA put me through some thorough exams - mental competency tests that were trying to trap me and the polygraph test - Ugh! I'd never go through this process again. If you think you can live the rest of your life with getting a polygraph test ever couple of years, then go for it. Personally, I don't have anything to hide, but polygraph tests royally suck.