It's the same problem that the ATF has with regulating guns or the FDA with regulating drugs; classifications are inherently limited and once you define one I c

It's the same problem that the ATF has with regulating guns or the FDA with regulating drugs; classifications are inherently limited and once you define one I can now make something that doesn't fit your existing classifications. Which is good, we don't want to give the government over-reaching powers, but we also want them to do something.