Verification of an employee's authorization to work has been a tenet of U.S. immigration policy since 1986, when Congress first required employers to verify the identity and employment eligibility of their workers. This less-known pillar of immigration enforcement, designed to address the jobs magnet that draws workers into the country illegally,  is receiving new attention as the federal government continues to refine and expand its electronic employment eligibility verification system, known as E-Verify. The research here examines issues associated with electronic employment verification and challenges in developing an effective system.