These include proving that states failed to diligently enforce certain statutes passed after the agreement, he said.Producers covered by the accord accounted for 91.6% of U.S. market share in 2003, down from 99.6% in 1997, PM USA said on March 8, citing PricewaterhouseCoopers, the settlement fund's auditor.The settlement, signed by companies including Reynolds American's R.J. Reynolds and Brown &