I’m sorry for your friend Daddy
Humans can’t get mad cow disease, since it can only occur, by definition, in cattle. They can, however, develop a related infection—called variant Creutzfeldt-Jakob disease (vCJD)—by eating contaminated meat. The most well-known outbreak of vCJD occurred in the United Kingdom in the 1980s and 1990s.
The cwd variety in deer has not been documented to be transferred via meat that’s why they advise to not be exposed to the spinal fluid, spinal column and or any brain and bone marrow. Not disagreeing with anyone here it’s not a joke but it’s not a valid reason to not enjoy the outdoors and partake in deer hunting if that’s your thing if not that s cool too!