Eerie Doctrine: General Rule

The Erie doctrine requires federal courts sitting in diversity to apply state substantive law and federal procedural law.

Related Law Applied by Federal Courts rules

• Erie: Substantive vs ProceduralIf a federal rule is on point and valid, it governs; otherwise apply state law if outcome determinative.
• Judicial NoticeJudicial notice allows courts to accept indisputable facts without formal evidence.

Part of Civil Procedure on Core Legal Rules — foundational MBE-tested principles with primary-source citations.