My husband was convicted of a felony marijuana charge seven years ago. This is the only negative thing that would come up in a security clearance investigation. Since then, he's obtained a master's degree and a PhD, we got married and had some kids. He's looking into careers in his field, many of which require a security clearance. My question is one that I cannot find the answer to... What security clearance levels should he not even bother looking at? I realize that security clearances are subjective to an investigation. However, surely there is a "minimum" requirement on some of the clearance levels which would render him unable to gain said clearance. As of now, he's not applied to any positions which require a security clearance because he doesn't want to waste anyones time with applying and interviewing if he will be turned away eventually. We've heard some only go back 7 years, while some go back 10, etc. Any guidance on which levels he would be eligible to obtain would be greatly appreciated.