Scents & CWD

I'm just wondering if anyone is concerned about CWD getting spread into the wild by the scents you buy & use to attract the big one.
If CWD is found mainly on game farms & places with high populations how can we be sure it is not in that bottle of doe in heat. That stuff is collected at game farms. One of the theories is that it is passed on through urine. Is it tested for prions before going to market?
I believe it is outlawed in some provinces.