Lord, what fools these mortals be....
The good old days when an overly inquisitive attitude would get, "yer hinquisitive nose broken for yer", seem to be gone. But sailors still tend to respond, "None of your [modifier] business." when faced with a bureaucratic busybody.
http://www.worldnetdaily.com/news/article.asp?ARTICLE_ID=26989
So, since there're no privacy issues with using SSNs as a national ID number, we can safely assume the bureaucrats, uniformed and not, will be asked, "Your papers pleece." ask often as, say a US congresscritter. Right?