Horse slaughter houses are currently legal in the US (they were banned for a while) but there aren't any so horses get shipped to Mexico instead. There is at least one horse slaughterhouse trying to open up in the US but the USDA is foot-dragging the process.
I tried them and it works. Halfway through my first drink, the bartender saw them, dragged me outside, and beat the shit out of me. I had to go to the hospital, but at least it wasn't due to alcohol poisoning!