The history of CWD and it's roots/handling over the years is fascinating, and raises a lot of questions surrounding it.
That being said, if you take a deer to a processor that has ever processed a "positive" case, you have already likely exposed yourself, as stated earlier in thread there is no way they are cleaning their entire shop between each animal to the required level. Also very few actually guarantee your specific meat back. Then throw in the fact that alot of these processors also do local raised animals that wind up in local shops and stores, well it doesn't take a leap to understand that WAY more people have likely eaten CWD venison or CWD exposed meat than can be comprehended.
It seems that unless you can process yourself fully at home, guarantee that you don't get dirty, can properly clean and disinfect everything involved, and store the meat until you get results, you really have no way to guarantee anything.
No way of knowing how this scales to large facilities as well, it's too much to worry about and too much to try to control, if it looks healthy I eat it, understanding that it may not be. I trust the probably not CWD more than I trust lab meat and meat fed and grown to scale.