The U.S. Citizenship and Immigration Service (USCIS) Office of Fraud Detection and National Security (FDNS) has initiated an H 1B audit program to assess employer compliance with H-1B requirements. FDNS will make unannounced Administrative Site Visits to H-1B employers and their clients, whereby the investigator will collect information regarding the legitimacy of an employer's business and the accuracy of the representations made in filed H-1B petitions. The purpose of this audit program and the associated site visits is to detect, deter, and combat immigration benefit fraud. USCIS has already sent tens of thousands of cases to FDNS, so it is important for H-1B employers to know what to expect and how to respond if FDNS comes knocking.