re: Should a paternity test be mandatory?

quote:

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Family courts that require a husband to financially support a kid that isn't his biologically, where the truth of paternity was fraudulently omitted, are part and parcel of this evil.

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Let’s say John Doe is married and he and his wife have a kid. He secretly has a paternity test within a month of birth (not suspicious of adultery, just checking to be sure) and finds out the kid is not his. What recourse does he have? What if (instead) ten years pass and some guy from his wife’s past comes out of left field and (out of guilt) confesses to being the real father and a paternity test confirms that John is indeed not the father.

How would those scenarios play out?