alt Hacker NewsFWIW I have held a security clearance during my career, and telling them I smoked weed was not a dealbreaker. What they are ultimately looking for is reasons why you could be coerced into divulging classified information. If you owe money due to drugs/gambling, etc, that's where it becomes a dealbreaker.
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You can see an archived list of industrial security clearance decisions here [0] which is interesting, and occasionally entertaining, reading. "Drug involvement security concerns" usually involve either actively using drugs or, worse, lying to cover up drug use, both of which are viewed as security concerns and grounds for rejection.
[0] https://web.archive.org/web/20170218040331/http://www.dod.mi...
wait, so I can apply and be honest? Sick! I just poorly misassumed they had classicly archaic interpretations of drugs.
The general rule is not to lie to them, because they will interview all your friends and someone somewhere will rat you out. It’s pointless to try to hide anything during these interviews, and, if you do it, then it’s a dealbreaker.