Personally, I think horse slaughter is dumb, mainly due to the fact that most people love their horses and give them all sorts of medication that will and does taint the horse's meat. Do I really want to be ingesting bute and other drugs that say on them "not for use on animals intended for human consumption" by eating a horse that had been treated with a drug like that? No thanks.
You do realize that any drug that is given to any animal does get out of their system with in a give time frame correct? Some like Anti Biotic is 3 days some are 7 and very few are 14 days. Past that the meat is safe to eat. It if was not then there would be no meat that would be safe to eat and no milk safe to drink.
How can anyone hate spinach???
On that note...didn't they find human feces (or the bacteria from it) in bagged spinach especially? I *know* that there was something about vegetables from Mexico being grown toooooooo close for comfort (read: illegal) to the latrine and human waste.
Nope, you have to get tryptophan from dietary sources. It's one of the more complicated amino acids and one we can't synthesize.
Of course it's necessary in a lot of proteins, but it's also converted into feel-good neurotransmitter serotonin. So much so that tryptophan (from milk, turkey, or supplements) is recommended for humans or animals with anxious energy problems. It has a calming and relaxing effect. You can't just give straight serotonin, because it won't cross the blood/brain barrier.