My first job was working in a slaughterhouse (beef); I had to go there a few times a week to obtain cow uteruses and then isolate the protein from the tissue in preparation for ob/gyn research on the effect of prostaglandins on smooth muscle tissue.
At any rate, I spent about eight hours a week in a slaughterhouse and observed the goings on. There were USDA inspectors: you could tell, because they were the only white people there. They spent most of their time in the office drinking coffee. Every once in a while, they would come to the killing floor, observe briefly, and leave once again. And this was in the days (1973) when controls and inspection standards were tighter/higher than they are today.
Caveat emptor.
Joanna