I doubt there are chemists sitting at home with an ICP testing heavy metal levels of all their produce. That would be a lot of work and expensive to maintain. In reality no one would even notice the toxicity unless FDA happened to check or someone got sick and traced it back.
> I doubt there are chemists sitting at home with an ICP testing heavy metal levels of all their produce.
It only takes one. Also, who says they're doing it at home? One hypochondriac willing to stay after work to use the equipment to quell their fears (or substantiate them) is all it takes.