"Common sense" was that you don't eat the poison. You remove it from the food first. You also remove any soil on the food, and if the food is sold in a box or can, you don't eat that, either.
The thing I want to learn, because I'm more interested in learning than I am in reveling in how right I am, is whether common agricultural poisons can be rinsed off with a bit of tap water, or if they're too sticky or too easily absorbed for that to be sufficient. Apparently they can't be washed off this easily, which is annoying, because I rather like buying my apples without worms in them.
Counterpoint: we routinely ingest poison intended to kill living beings. Sometimes we even have said poison injected in our bodies.
Those poisons are also commonly known as antibiotics (anti: against, bio: life), antifungals, antihelminthics, etc
Not everything that harms pests necessarily harms human beings.
Gasmasks, used when applying insecticides manually, are just for show. Laws outside of the US, which prohibit certain use of chemicals, are just random.
Common sense prevails yet again.