Arsenic is in our bodies, the air, water, smoke, dirt, etc, etc, etc.
I found this article interesting: LINK
"Despite its notoriety as a deadly poison, arsenic is an essential trace element for some animals, and maybe even for humans, although the necessary intake may be as low as 0.01 mg/day."
The question is, how much arsenic is in a stink bug? How many stink bugs would I need to eat to get a fatal dose, compared to how much city water I would have to drink?