One would hope the Ministry is checking their employees for Dark Marks... :-)
Okay, this is a horribly stupid question, but what exactly does Lucius Malfoy do for a living?? Has she ever said? He's always at the Ministry, but I don't remember ever hearing a job mentioned.
Hee hee. But from what I understand, the Mark goes away until Voldy calls them. That leaves some wiggle room. :)
BTW, I am not 100% on Malfoy working at the Ministry. I just got that from Chamber of Secrets (the movie, that is) when the Malfoys and the Weasly's have that showdown in Flourish and Blotts! :)
I am quite likely wrong, since now that you mention it, I don't recall JK mentioning a job for him at all, other than being a school governor. That line from the movie "See you at work" is probably just a throwaway line, anyway.