From the Summary: "Many years of debate about unauthorized immigration to the United States culminated in 1986 with the enactment of the Immigration Reform and Control Act (IRCA). [...] Ten years later, in the face of a growing illegal alien population, Congress attempted to strengthen the employment verification process by establishing pilot programs for electronic verification, as part of the Illegal Immigration Reform and Immigrant Responsibility Act of 1996 (IIRIRA). The Basic Pilot program (known now as E-Verify), the first of the three IIRIRA employment verification pilots to be implemented and the only one still in operation, began in November 1997. [...]. The 111th Congress has considered provisions on E-Verify as part of the American Recovery and Reinvestment Act of 2009 (H.R. 1) and the Omnibus Appropriations Act, 2009 (H.R. 1105). Other legislation on E-Verify or on electronic employment verification more broadly may emerge in the future. In weighing such proposals, Congress may find it useful to evaluate them in terms of their potential impact on a set of related issues: unauthorized employment; verification system accuracy, efficiency, and capacity; discrimination; employer compliance; privacy; and verification system usability and employer burden."
CRS Report for Congress, R40446