Head cheese and souse are no longer on my list of foods. Since CJD and CWD are found in neural tissue, I don’t think its worth the effort. Also, if the cow or hog is killed with a bullet there are pieces of metal in the brains. Even with a captive bolt there are little shard’s of bone throughout the tissue.
Never much cared for headcheese myself, even when we made it from livestock we butchered ourselves. Family I boarded with for awhile as a youngster liked to make it along with the chitlins, apple butter, lye soap, and so forth. Their daughter liked to tease me with a breakfast of brains an’ along with fresh buttermilk.