Federal preemption

All of the kinds of federal preemption

In the law of the United States, federal preemption is the invalidation of a U.S. state law that conflicts with federal laws, treaties, or enforcement. The rules of preemption seek to restrict it to only where it is explicit or necessary. In the course of adjudicating cases, the issue of preemption may be heard in either state or federal court but is ultimately decided by the Supreme Court of the United States.

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