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Culture War Roundup for the week of May 4, 2026

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If I'm reading correctly, California allows cohabiting spouses two years after the date of birth to dispute paternity. I think Indiana, too? I'm not sure of anywhere with a statutory block, but paternity-by-estoppel states can supposedly get really messy even with clear genetic evidence.

... uh, hilariously, Pennsylvania does actually have case law blocking genetic testing for paternity in some cases and seems to have a paternity-by-estoppel statute.

As a preliminary matter, you're not going to find any estoppel statutes (there may be a few but that would be rare). Estoppel is an equitable doctrine that prevents someone who has engaged in a course of conduct that creates a reliance interest from reneging to the detriment of another. I don't have time to go into too much detail but see this case. It, along with the first one you cited, gives a good overview of the contemporary views of the presumption of paternity and paternity by estoppel. As to the former, the court concludes that:

This Court’s decisions, however, have held steadfast that there is a single circumstance under which the presumption of paternity continues to apply, and, indeed, is irrebuttable –where there is an intact marriage to preserve.

To quote the relevant part of the opinion you cited:

In order to determine the paternity of a child born in wedlock, courts first must determine whether the marriage is intact at the time of the paternity challenge. If so, then the presumption of paternity applies, and dictates that, regardless of biology, the mother’s spouse will be the child’s parent. However, the presumption may be rebutted if the putative father produces clear and convincing evidence that: (1) there is a reasonable possibility that DNA testing would reveal him to be the child’s biological father; and (2) determining parentage based upon DNA testing serves the best interests of the child, with due consideration for the interests of the potential father as well as the interests of the wife and husband. If the court finds no threshold possibility of paternity, or determines that adjudicating paternity by DNA testing would disserve the relevant interests, then the presumption governs. But if the court finds a threshold possibility of paternity, and determines that the balance of interests lies in assigning paternity based upon the biological truth, the presumption must yield, and the court should order appropriate genetic testing to determine paternity of the child.