Federal agencies across government use the Social Security Death Master File to check if benefits recipients have passed away. Some agencies have cited some success using that file to cut improper payments. But the Government Accountability Office finds some shortcomings with the Death Master File and the way SSA makes it available to your agency. Dan Bertoni, director of education, workforce, and income security issues at the GAO, explains what the Death Master File is, and where SSA gets the information in it.