Some amazing investigative reporting from animal rights activists has unveiled the truth behind gas chambers used in pig slaughtering. The hog industry says these chambers are "humane", "painless", and "stress-free" methods of slaughtering hogs, watch the footage and decide for yourself.
I mean holy shit. That's pretty awful. The industry has been lying to everyone this whole time. The public, the USDA. Everyone.
Here's an article that goes into more detail: