It's not clear where the heavy metals are coming from. One possibility mentioned in the article is the soil itself. I wonder if even potting soil is tested for heavy metals? If heavy metals get through whatever food testing is done by the FDA, McCormick, etc., I don't have great confidence that soil testing is any better. That said, I would think growing your own is safer.
> If heavy metals get through whatever food testing is done by the FDA
About that...
> In addition, the limited testing the FDA has done on spices has been focused on harmful bacteria, such as salmonella, not heavy metals, Ronholm says.
The reason for these is probabaly the extreme depths from which water is pumped. The normal shallow ground waters arent this bad with arsenic I would assume.
I wonder if hydroponically grown herbs would lack them. Could be a business opportunity, if people care enough (or the government steps in to regulate).
