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I don't believe that would be politically tenable. The state / society wants fathers (or at least someone) to pay child support. This kind of law would have a chilling effect on mothers who claim or simply allow someone to take the child's role as a father, even if they're not sure.

That doesn't make much sense to me since you can lie about a vasectomy or, more simply, about pulling out.

Only the woman, at the end of the day, when it comes to men she can't trust, can either avoid getting raw-dogged OR take a contraceptive to be sure, herself, since she's the one at risk of getting pregnant.

Are you talking about condoms or hormonal birth control? Are there results on a study I can read somewhere about how often people lie about contraceptive use? Can't find anything.

You could have a medical procedure certification card.