I read the article and looked up the mentioned substance, so if you're on a watch list so am I (cheerful grin). It mentioned it being used at times for euthanasia/immobilization of horses, and that reminded me of an episode of Criminal Minds, 'No Way Out'. The killer in that uses a horse tranquilizer to immobilize his victims but keep them aware. I can't believe I forgot about that one. Luckily, I have that season of the show and can look up what it was.
As for why I was going for paralysis instead of just knocking them over the head is because, like the character on that Criminal Minds episode, the killer is a particularly sadistic bastard who is cannibalistic, and wants to fill those last few minutes of the person's life taunting them with their fate. Its actually going to be the final book in a series of stand-alone novellas I'm working on focusing on the mentality of killers and what motivates them. Each one covers a different type of killer, and I decided, due to the content, that the 'cannibalistic killer' is best saved as the final book since that, I think is the most horrific type of killer. But maybe that's just me.
Anyways, thanks for doing that link, because I wouldn't have remembered the horse tranquilizer thing. Since the guy I'm making into the killer lives in a sort of rural area outside of a large city, it wouldn't take much to make him to a horse-breeder or something.
Of course, that means I'll have to look up horse-breeding, which shouldn't get me on any watch-lists, LOL.