It should be, but there is no way to prove that even a wild caught animal is pure. There's so many critters that get let go or lost, who knows what sorts of genes were introduced into wild generations. It's impossible to trace where all these morphs have come from, so I still stick to my original position.. If you're concerned on keeping "pure" cornsnakes, then only buy and trade with others who have lines that they can prove are "pure". Don't go off the beaten path and buy any morphs, because they could all, honestly, be questionable. In my opinion, if it looks like a corn snake, behaves like a corn snake (both with physical characteristics and personality) then it's good enough for me. Like the tequila sunrises, they are absolutely stunning. Should they be banished from the hobby just because no one 100% can point to their origin? I don't think so. They're cool looking snakes, and I like them! I also like my ultramel, and my tessera, and all my other snakes.