Hanna v. Plumer Two-Part Test for Federal Common Law

Hanna v. Plumer (1909) is a foundational Supreme Court decision that addresses when federal courts sitting in diversity must apply federal common law versus state law. The case clarifies how the Rules of Decision Act interacts with federal interests and state policies in choice-of-law questions. The two-part test that emerged from Hanna helps judges decide whether a given issue should be governed by federal rules or by state law, based on the presence of a federal policy and the potential impact on federal interests.

What Hanna v. Plumer Decided

In Hanna v. Plumer, the Court held that federal courts should apply state law under the Rules of Decision Act unless a federal rule or federal policy dictates a different result. The decision emphasized that federal common law should be used only to advance federal interests and when a federal rule is necessary to ensure a uniform nationwide policy. The ruling thus established a framework for balancing federal and state influences in diversity cases and set the stage for the later development of Erie doctrine jurisprudence.

The Two-Part Test Explained

The Hanna two-part test is a practical tool for determining whether federal common law governs a particular issue. The steps are: Step 1: Is there a federal rule or policy on point? If a controlling federal rule or statute exists that directly addresses the issue, the court applies it. Step 2: If no federal rule governs the issue, does applying state law undermine a federal policy or interest? If applying state law would frustrate a federal objective, the court may adopt federal common law to avoid that outcome. If neither step calls for federal law, state law applies. This approach preserved federal authority in areas where uniform national standards were essential while ensuring state policies could prevail in other areas.

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How Courts Apply It Today

In modern practice, federal courts consider Hanna as part of the Erie framework to decide when federal law should guide decision-making. The focus remains on ensuring that federal questions and interests are protected without disturbing substantive state policy where it matters to the outcomes in state-law claims. Courts examine the presence of a federal rule, the significance of federal interests, and the potential impact on the outcome of the case. When applicable, federal common law is used to fill gaps or provide a uniform rule that state law could not achieve consistently nationwide.

Practical Implications and Examples

  • Procedural versus Substantive Questions: Hanna historically supports applying federal procedural rules only when a federal policy requires it, while substantive questions typically follow state law unless a federal rule exists.
  • Liability and Negligence Standards: In some tort cases, federal common law may govern choice-of-law issues if a federal policy is implicated, but otherwise state law controls.
  • Notice and Service of Process: These areas often reflect federal procedural preferences, potentially invoking federal rules when a federal interest is at stake.
  • Uniform National Standards: When nationwide consistency is essential for federal programs, Hanna’s approach supports applying federal rules to avoid divergent outcomes across states.

Limitations and Evolution

Over time, the Hanna framework was refined by subsequent Erie decisions, which emphasize that state substantive law governs in diversity actions unless a federal rule is controlling or a federal policy requires a different result. Critics argue that Hanna’s two-step test can be indeterminate in complex cases, prompting courts to rely on a broader Erie-based analysis. The modern view tends to integrate Hanna with the broader principle that federal common law exists to further federal interests and to ensure consistency where state law would conflict with those interests.

Key Takeaways

  • Hanna v. Plumer establishes a two-part framework for deciding when federal common law applies in diversity cases.
  • Step 1 requires a federal rule or policy on point to apply federal law directly.
  • Step 2 considers federal interests to determine if federal common law should apply to avoid undermining those interests when no federal rule exists.
  • In practice, Hanna is used alongside Erie doctrine principles to balance federal and state influences on law in federal courts.

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