SSA has issued guidance and provided training to assist staff in processing benefit claims under Section 211, but the absence of certain internal controls has allowed some errors to go undetected. SSA issued detailed guidance in August 2004 and subsequently provided staff with training on the law, which some SSA field offices supplemented with additional training. Although SSA’s policies and procedures were fairly detailed, GAO found several incorrect claims determinations and a lack of internal review for preventing them. With regard to the provisions of Section 211, GAO found that SSA improperly approved 17 of the 19 claims that involved noncitizen workers who had been issued SSNs after 2003 and who lacked required work authorization. GAO also found that 1 of the 41 claims that SSA disapproved was improper. SSA officials stated that the improper determinations were likely due to staff’s unfamiliarity with the new requirements. In addition, GAO found that letters sent to claimants informing them of disapproval decisions did not always contain all required information.