I. Whether 18 U.S.C. §922(g) authorizes conviction upon proof that a firearm once crossed state lines at an unspecified prior occasion, when there is no evidence that the defendants' conduct caused such movement, nor that it moved in the recent past?

II. Whether the sufficiency of a factual basis for a defendant's plea should be subject to plain error review, or whether, under Sullivan v. Louisiana, 508 U.S. 275 (1993), such a case lacks "an object" upon which review for harmless and plain error may operate?

Whether 18 U.S.C. §922(g) authorizes conviction upon proof that a firearm once crossed state lines at an unspecified prior occasion, when there is no evidence that the defendants' conduct caused such movement, nor that it moved in the recent past?