The first time I stepped foot in the stack was late last October, after I had been working at the plant for more than four months. To find it, I arrived early one day and worked my way backwards down the chain. It was surreal to see the slaughter process in reverse, to witness step-by-step what it would take to reassemble a cow: shove its organs back into its body cavities; reattach its head to its neck; pull its hide back over its flesh; draw blood back into its veins.During my visits to the kill floor, I saw a severed hoof lying inside a metal sink in the skinning room, and puddles of bright-red blood dotting the red-brick floor. One time, a woman in a yellow synthetic-rubber apron was trimming away flesh from skinless, decapitated heads. A USDA inspector working next to her was doing something similar. I asked him what he was cutting. “Lymph nodes,” he said. I found out later that he was performing a routine check for diseases and contamination.On my last trip to the stack, I tried to be inconspicuous. I stood against the back wall and watched as two men standing on a raised platform cut vertical incisions down the throat of each passing cow. As far as I could tell, all of the animals were unconscious, though a few of them involuntarily kicked their legs. I watched until a supervisor came over and asked what I was doing. I told him I wanted to see what this part of the plant was like. “You need to leave,” he said. “You can’t be here without a face shield.” I apologized and told him that I would get going. I couldn’t have stayed for much longer anyway; my shift was about to start.