"The workers sued the federal government, claiming that NASA was invading their privacy by requiring the investigations, which included probes into medical records and questioning of friends about everything from their finances to their sex lives."
medical status and sexual habits have NOTHING to do with whether or not someone is gonna sell secrets to the commies. sorry employer, whomever you are, none of your business. perhaps some level of inquiry into financial status and credit history does have bearing on whether somebody's gonna get desperate for cash.
in any case this all smells like a big rationalization for ass-covering regulations, that one can refer to when secrets slip out. "oh, we checked 'em, all right. we did our jobs." in others words, probably no substitute for real security protocols. but that's probably too hard for them government bureaucrats, right?