USCIS started the Administrative Site Visit and Verification Program in 2009 as an additional way to verify information in certain visa petitions. The types of petitions most subject to random site visits are H-1B and L-1 petitions. Usually a site visit is conducted by a Fraud Detection and National Security (FDNS) officer to check in and verify the facts stated in filed petitions after visa approval to ensure visa compliance. Employers with H-1B and L-1 approvals should note that a site visit can be conducted at anytime and any day at their worksite(s). Officers select petitions to review and check at random.