Cumin always shows up on these lists, whether it's with heavy metals or something else. It's to the point where I've more or less just stopped cooking with it because I don't trust it to be safe.

Get yourself a dehydrator and try making it yourself. I've started doing this with my herb garden and the catnip I grow for my cats. They much prefer the stuff I make than the stuff from the store as much as I enjoy my fresh dried (oxymoronic??) herbs. I haven't tried cumin yet. We'll see how the peppers in this years attempt at gardening goes.