This isn't just about paternity issues, it's about secret DNA tests for whatever reason you can think of. As you say, up to now they are against the law; today's verdict will be decisive regarding the legality of any secret testing.
HIV testing in South Africa is not allowed as a basis for seperating risks in life insurance in South Africa ... although if it were allowed legally you can imagine the repurcussions - I still think we're quite a bit away from the feasability of what you're getting at (even on cost basis never mind legality).
