...that theory United States v. Lopez might have come out differently because it was not “really disputed” in the Lopez case that the gun in question had crossed state
lines. In Lopez, however, the defendant made a facial rather than an as-applied challenge to the statute and, more to the point, the government did not try to prove that the gun had crossed state
lines. Indeed, the court of appeals in that case noted that “[c]onceivably, a conviction” under the statute “might be sustained if the government alleged and proved...