On the off-chance this is legit, bute.
Most horses in the US have been treated with bute at some point in their lives. Once a horse has had this in their system, they are considered unfit for human consumption. There are several other drugs given to them that can make them unfit for human consumption, but bute is to the horse world what advil/tylenol is to humans pretty much everyone's had it at some point, and likely more than once.
Also, horses can be difficult to kill humanely. Unlike cattle or goats, you can't use a stun bolt on them because their skulls are so thick. For a humane kill you either do it with meds (unfit for consumption again) or with a .22 rifle, pressed to a very specific part of the forehead (and a higher power than .22 is usually recommended to ensure no mishaps.)
Wow, that was very informative. Thanks!
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