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People v. Lewis, 295 Ill. App. 3d 587, 693 N.E.2d 916 (Ill. App. Ct. 1998)

1. According to the court, when does Congress have the power to preempt state law?
2. In the absence of preemption by Congress, why does the state have the power to convict a person of a crime for conduct that violates both federal and state law?
3. What are the three different ways in which a state law can be preempted by a federal law?
4. Does a state court have the power to interpret federal law?