Gunplummer---I believe CWD was first found in northern Colorado and then on into southern Wyoming. I dont believe it had anything to do with exotic animals, although now most states have really clamped down even on movement of any dead ungulate animal parts. This especially includes the skull and brain that must be thoroughly cleaned out before movement between most states. The big thing is that now with modern technology being able to test down into the parts per billion many things besides CWD are being found that have probably been in existence since the beginning of time. EHD from midge bites has no preventative or cure and is killing a lot more deer than all the other stuff, including CWD, combined. It's a swift, nasty killer of any animal that gets it and it's not spread from animal to animal.