federal · federal
Federal Preemption Doctrine
U.S. Const. art. VI / case law
Federal law can preempt state law expressly (statute says so), by field (federal scheme so pervasive it occupies the field), or by conflict (compliance with both is impossible, or state law obstructs federal objectives). Rooted in the Supremacy Clause.
preemptionsupremacyconflictfederal