From the Summary: "This report opens with an overview of the grounds for inadmissibility and summarizes key legislation enacted in recent years. The section on current law explains the legal definitions of 'terrorist activity,' 'terrorist organization,' and other security-related grounds for inadmissibility and analyzes the legal implications of these provisions. The report then discusses the alien screening process to identify possible terrorists during the visa issuance process abroad and the inspections process at U.S. ports of entry. Where relevant, the report also discusses how recently enacted legislation -- the Intelligence Reform and Terrorism Prevention Act of 2004 (P.L.108-458) -- affects these matters. Provisions in the Real ID Act (H.R. 418), introduced in the 109th Congress by House Committee on the Judiciary Chairman James Sensenbrenner and passed by the House on February 10, 2005, are also discussed."
CRS Report for Congress, RL32564