The majority of companies that have to file reports to the US financial regulator on their use of minerals mined in the war-torn Democratic Republic of Congo fail to fully comply with the reporting requirements...Global Witness and Amnesty International estimated that four out of five companies are falling short of the...requirements...However, General Electric, Hewlett-Packard, Microsoft and Tiffany & Co were among the companies that fully complied with the filing obligations...Consumers cannot have confidence that adequate measures have been taken by the majority of companies to properly understand their supply chains...Global Witness and Amnesty International found that...[o]nly 16 companies said they knew which country their minerals came from...[Refers to Apple]