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I read a summary of this issue and it looks like chocolate levels of heavy metals is trivial, lower than levels permitted in drinking water.
I'm not sure I see what's oniony here >

I think the notion that there's a "safe amount" of metal in your chocolate. >

no, it's not.
This article is right and it doesn't belong in this subreddit.
The metals in question are cadmium and lead which are found in trace amounts in all soil which is why the FDA has guidelines for safe amounts. Why? Plants absorb nutrients from the soil so the food reflects the soil it came from.
What's this article about?
A recent Harvard study showed where the Hershey's corporation is sourcing their cocoa contains high levels of lead and cadmium well beyond the trace amounts found naturally in soil and is therefore is illegal to use.
The Hershey's corporation is still using this contaminated cocoa despite it being detrimental to human health.  This is an article about a business knowingly using substandard materials and toxic materials to earn more profit.
This is not an article for the not the onion subreddit as unsafe levels of these two metals have been found in chocolate this is a fact.
Mods will you please remove this article. >

I appreciate your knowledge and willingness to share. There is one stipulation I want to point out, though. "nottheonion" doesn't mean false news. It is supposed to be accurate, but it just has to sound fake/hard to believe. Mods throw around the term "oniony" with that general/imperfect definition, but it is subjective enough to create arguments.