There is no way, down the road at least. He can microchip all the babies and sell them for what they are, but then all of those people have the same responsability. How can anyone who produces hybrids guarantee that somewhere down the road someone with F3s or F4s all bred back to pure bps or pure carpets will be as honest. I think that's the last thing the carpet hobby needs at this point. And we've seen this exact issue happen with every species that's been hybridized; corns, carpets, boas... Truely responsible and honestly represented hybrids don't happen in the long run, no matter how responsible the intentions are at the begining of a project.