Choose dark chocolates with the lowest levels of heavy metals. CR’s tests found five chocolates—one each from Mast, Taza, and Valrhona, and two from Ghirardelli—with relatively low levels of both lead and cadmium. Eight more are lower in only lead, and 10 others in just cadmium. Only five bars—one each from Green & Black’s, Lily’s (owned by the Hershey company), and Trader Joe’s, and two from Theo—were higher for both heavy metals.
There do seem to be a few ethical sources for it; I know Tony’s says they “try, but can’t guarantee” it comes from ethical sources, but there are some single origin chocolate makers out there, although they’re more expensive.
That's an issue John Oliver brought up. Even the ones that try to source it ethically can't guarantee it and I just don't want to risk being complicit in that.
Sure, we all take advantage of people in other ways all the time, but this seems like an easy thing for me to stop doing and try to make the world just a tiny bit better... or at least feel a tiny bit better about my part in it.