In sourcing, electronics companies (Apple, Intel, etc.) currently "trust their suppliers" to ensure that conflict minerals (those that are illegally mined and exported in Eastern Congo, profits of which go towards groups such as those directly involved with Rwanda's genocide) are not used, but don't provide solid proof for consumers.
Proof is what DC-based advocacy group Enough! Project is calling for, through a detailed and tedious audit of the supply chain. See this article over on MetalMiner to judge where you stand on the issue, and how you think policy should be correctly advocated to create the best changes to benefit the most people.