 The priority review voucher is a provision of the Food and Drug Administration Amendments Act (HR 3580) signed by President George W. Bush signed the bill in September 2007 which awards a transferable "priority review voucher" to any company that obtains approval for a treatment for a neglected tropical diseases.The system was first proposed by Duke University faculty David Ridley, Henry Grabowski, and Jeffrey Moe in their 2006 "Health Affairs" paper