You're welcome to show me (I'm from Missouri) where anyone has seriously suggested strychnine or other "official" poisons are foods.

Which is very different from e.g. pointing out that while strychnine has an human LD50 of 1-2 mg/kg, "In low dosages, strychnine can act as a stimulant and has been used by athletes to enhance their performance." followed by a couple of Olympic examples in 1904 and 1992 (https://en.wikipedia.org/wiki/Strychnine).