All babies who have a father named on the birth certificate should be paternity tested at birth. Paternity fraud is too easy to commit and too harmful to the victims. The reason it should be standard procedure is that some men, like Andre’s friend, will not suspect they’re being screwed and thus have no reason to order the test themselves… at least not until it’s too late to rectify it because of the law many states have which says that if a man has ever at any point accepted paternal responsibility, he is obligated until the child is 18 regardless of what comes out later. Another reason is men like cybercurious’ husband, who can’t request proof even if he does suspect. As usual in today’s social and legal climate, men are over a barrel with few options for protecting themselves or being compensated when abused. If I choose to get married, I will have a prenuptual contract guaranteeing that any children born of the union will be tested for my paternity.
This does not accuse all women of being lying whores. It protects men, who are highly vulnerable in and to this situation, from the minority of women who are. Good girls have nothing to hide, so there's no reason to be disturbed by this suggestion.
As for paternity being about more than blood. That is, of course, true, but as a legal professional, I can tell you the law does not deal in feelings and the value of what goes on in your heart. It deals with who is responsible for a situation and what they owe. Any adult can love any child as their own, but that is not the law's affair.