I don't know, that seems like a tautology - the only reason it can be weaponized against your enemies is because it's taboo.
I thought it was a pretty clever idea.
This also applies to people with large amounts of debt - which IIRC is one of the most common reasons people are denied clearance. See here for more info (scroll to "Vulnerability to Coercion"): http://www.dhra.mil/perserec/adr/falsification/falsification...
I think there was a guy that was caught spying recently that had a gambling addiction.