The application of the federal prohibition of felons possessing firearms is a stretch of the Commerce Clause. Most cases involve a felon who merely happened to be in possession of a firearm. The only relationship to interstate commerce in these cases is that the firearms found were usually manufactured in another state. The application of this prohibition leaves the future of federalism in question.
Brent E. Newton,
Felons, Firearms, and Federalism: Reconsidering Scarborough in Light of Lopez,
3 J. App. Prac. & Process 671
Available at: http://lawrepository.ualr.edu/appellatepracticeprocess/vol3/iss2/18