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Of Congress expressly states that it intends to preempt state regulation, a state law is inconsistent with federal laws, even though no express preemption statement has been made by Congress, a state law regulates a subject that belongs exclusively to the federal government or Congress has enacted a legislative scheme that comprehensively regulates a field, the one that is not an example of a form of preemption
What is a state law regulates a subject that belongs exclusively to the federal government?