Harold Berk sued Dr. Wilson Choy and Beebe Medical Center in federal court for medical malpractice under Delaware law. The parties were citizens of different states, establishing diversity jurisdiction. Under Delaware statute, a plaintiff cannot sue for medical malpractice unless an affidavit from a medical professional attesting to the suit's merit accompanies the complaint. Berk failed to provide this affidavit, and the District Court dismissed his lawsuit for failure to comply with the state law. The Third Circuit affirmed, concluding that the state law was substantive and applied in federal court under the Rules of Decision Act. The Supreme Court granted certiorari to resolve whether the state affidavit requirement could be enforced in federal court.
The Court began by analyzing the choice-of-law framework. While the Rules of Decision Act generally directs federal courts to apply state substantive law, the Rules Enabling Act authorizes the Supreme Court to adopt uniform rules of procedure that displace contrary state law. The Court applied the test from Shady Grove Orthopedic Associates: if a Federal Rule answers the disputed question, it governs unless it exceeds statutory authorization. The disputed question was whether Berk's lawsuit could be dismissed because his complaint lacked an affidavit. The Court found that Federal Rule of Civil Procedure 8(a)(2) answers this question by requiring only 'a short and plain statement of the claim showing that [the pleader] is entitled to relief.' Rule 8 implicitly establishes that evidence of the claim is not required at the pleading stage. Rule 12 reinforces this by limiting dismissal to 'failure to state a claim' and prohibiting courts from considering matters outside the pleadings. The Court rejected the defendants' argument that the affidavit requirement was a valid 'precondition to proceeding' or that Rule 11 incorporated state affidavit laws. The Court clarified that Rule 11 concerns affidavits from the attorney or party, not third-party expert affidavits. Because Rule 8 and the Delaware statute answer the same question with different standards, Rule 8 governs. The Court further held that Rule 8 is valid under the Rules Enabling Act because it 'really regulates procedure' and does not abridge substantive rights.
The decision ensures that federal courts apply uniform federal pleading standards rather than varying state procedural hurdles for medical malpractice claims. Plaintiffs in federal court can now proceed with complaints that meet the 'short and plain' standard of Rule 8 without needing to secure an expert affidavit at the outset. The case is remanded to the District Court to allow the lawsuit to proceed. Defendants retain the ability to challenge the sufficiency of the evidence through a motion for summary judgment under Rule 56, which allows for discovery and consideration of matters outside the pleadings.