The Government Accountability Office (GAO) has done a study on whether Social Security is properly reducing Disability Insurance Benefits by workers compensation benefits paid to former federal employees and found problems. GAO found that the agency was not detecting 13% of the cases where there should have been an offset and that there were probably more cases but GAO could not say for sure due to limitations in Social Security's data. The underlying cause of this problem is Social Security's failure to do a data match with federal workers compensation records. Social Security has felt that such a match would not be cost effective. I was under the impression that the agency was already doing data matches with state workers compensation records. I don't understand why they wouldn't do the same with the federal workers compensation records.