"So there you have it, ladies and gentlemen. Even in the era of Identigene, you can still cheat on your husband and have a child that's not his and get away with it - as long as it's with your husband's identical twin (and he's able to keep the secret, which is apparently hard for twins)."*
So maybe I'm just being pessimistic...
But, I'm thinkin'... anybody who feels the need to use this test, might be better off not being married anyway...