Hammerstein v. Superior Court of California

Background

A woman named Reggie Hammerstein, suing through her mother and guardian, filed a paternity case in a California trial court. The man she named as the father said he lived in New York and entered a special appearance arguing California courts had no power to make him defend the case. He asked the California court to quash service of process in New York, saying any judgment would violate his right to due process. The motion was denied and the California trial court entered judgment for the woman. The man sought review in the state appellate court and the California Supreme Court, but both denied relief without issuing opinions.

Reasoning

The Supreme Court agreed to consider the case but noted a basic problem: the state courts issued denials without explaining whether they relied only on state law or also decided the federal due process question. If the state courts based their rulings on independent state-law grounds, the Supreme Court cannot review them. If instead the state courts decided the federal question on the merits, then the Supreme Court can decide the federal claim. Following earlier practice in a similar case, the Court paused the federal review to allow the man to ask California courts for a formal statement or certificate explaining the basis for their rulings.

Real world impact

The immediate result is that the Supreme Court did not rule on whether California could exercise jurisdiction over the New York resident. The case is stayed so the petitioner can seek clarification from California courts; the outcome could end the federal case if state-law grounds alone supported the judgment. This is not a final decision on the federal due process claim.