http://yarchive.net/risks/mongrel.html
"The lesson was clear: if you want a clearance in a hurry, put something on your history form that will make the investigators suspicious but that is not damning. They get so many dull backgrounds to check that they relish the possibility of actually nailing someone. By being a bit provocative, you draw priority attention and quicker service."
Extremely bad idea. Cue cautionary tale; a friend of mine (here in the UK) wrote something similar on his form (that he'd been ticked off for smoking weed). They didn't refuse him but he has consistently had random drugs tests for the last 3 years (at a rate of about one every 2 months).
The fact of it is if you tick "yes" to any of those questions you're setting yourself up for a fall. The review officer is extremely happy if you ticked no - because he can just run the default checks and not have to interview you :)
I was an ordinary programmer in the Air Force, however I obtained a top secret clearance. Basically ticked "no" to all the boxes, however one of my friends and probably a few of my past teachers were interviewed. Someone once told me his interviewer knew he had thrown a dead squirrel at a girl in kindergarten.
I don't get that. Why blackmail? I would assume that they feel people with financial issues are more susceptible to bribes to make their financial woes go away. Blackmail is just odd though. I wouldn't necessarily broadcast my financial woes to the world, but "Steal some Top Secret documents or we'll tell the world that you're in massive debt" wouldn't have any leverage with me (and I assume this is the same for most people).
The world knowing that you're in debt is probably too small of a carrot to have someone take the risk of leaking documents/information.
Sorry; it was a lie, I was replying to the poster above who said it might be suspicious to admit to nothing, even if it is true.