When has that ever happened in the long run? How many people who own creamsicle corn snakes even know that they own a hybrid, and how many people who have corns know whether or not it has any rat blood? How many people who own carpet pythons or boas can say for a fact that they have a pure sub species or pure locality animal? There are quite a few people who can't, but a good amount of them will breed them and sell the offspring as what they think/assume/hope/wish they are. And once even one person does that, every generation after that, and all the breeders who work with any decendant after that is unknowingly working with, producing and selling hybrids as pure blood animals. And at that point, the whole CB species is in question.
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