User blog comment:LuffyPirateKing/Luffy and his belly/@comment-1595565-20121021173205/@comment-3119203-20121022023918

I think the Gomu Gomu no Mi is a completely normal fruit. And considering the CP9 is one of the greatest spy agencies in the world (they found out about Pluton, that takes some skill), I think they know what they are talking about. Vegapunk's probably done some kind of test on this anyways.