Are there legitimate uses for it that are NOT related to date rape? I think that is the question that should be asked ... and if it DOES have legitimate uses unrelated to rape, then I would assume it would be okay to sell it. Not saying I agree with doing so (because I know there will be people buying for awful purposes), but I think you're free to list it. Especially since, as someone already pointed out, cyanide is already being sold here. :\