vocallyI have a scenario where a fast-acting (an hour or less; two is suboptimal but workable) poison is administered to someone by ingestion in a glass of whiskey, without their knowledge. The person administering the poison is supposed to have at least academic understanding of such things (poisons in general) but does not have access to commercial sources and would have to make something on their own. Undetectability isn't important--it's in a setting where the police are incompetent/corrupt/uncaring and the victim isn't important, so there wouldn't be a postmortem. But it's fine, maybe desirable, if it's just off enough that some people have some doubts (without an incentive to pursue them). My thought is a really old standby: poison hemlock. I've seen reports of people who've been killed confusing the plant with a wild edible and eaten the leaves in a salad, or mistaking the roots for parsnips, though obviously either won't work for drinking. It's set in a season where seeds wouldn't be available so it would probably be the roots; would making them into a tea and pouring that into the whiskey do what I'm asking about? Could/would the tea be concentrated enough to be slipped into another drink? Hemlock also works because, from what I've read, it has a period where paralysis sets in but the victim is aware, and the poisoner needs to gloat a bit. Any other suggestions?