The USCIS Office of Fraud Detection and National Security (FDNS) has initiated an assessment of the H-1B program, involving unannounced site visits to H-1B employers and their clients. Employers must be prepared for these visits, which may include interviews and document verification, and are advised to maintain accurate records and prepare representatives accordingly. FDNS's goal is to combat immigration fraud and ensure compliance with H-1B regulations, potentially impacting employers' petitions based on findings from these site visits.