flap15:
I believe a national ID card system is a good thing and only those with somthing to hide need fear it.
I think the preferred response at this point is usually to ask how much you earn, when you last had sex and with whom.
Most people get the point at this stage and most of the rest probably ought to be carrying cards to identify them and warn the rest of us what we're dealing with. Unfortunately it doesn't work with politicians because what they earn is a matter of public record and the rest is probably already in the tabloids.