Is it me or was the title of the article here at Macrumors terrible? Why would you basically use a double negative to say "Do Not" and then "Unethically"....
Why wouldn't we just say "Apple confirms Suppliers use Ethically Sourced Tantalum"?
It expresses exactly what it wants to express. A supplier could use both ethically sourced and unethically sourced Tantalum. That supplier could truthfully (but misleadingly) claim that they use ethically sourced Tantalum. We don't care about that. We care about unethically sourced Tantalum.
On the other hand, a supplier might not use Tantalum at all. You ask him "do you use ethically sourced Tantalum", and he must truthfully answer "no". And now everybody thinks the worst of him. Saying "I don't use unethically source tantalum" expresses exactly what we want to know.