USCIS' Fraud Detection and National Security (FDNS) office has recently explained the three types of site visits that are currently being conducted:
1. Risk Assessment Program fraud study (RANDOM VISITS). This is a joint study by USCIS and ICE applicable to both family-based and employment-based cases. Cases are chosen for randomly for review and site visits usually after a case is approved. The purpose of this study is to build a profile of the types of cases where fraud is most prevalent.