With terrorism still prominent on the U.S. agenda, whether the country's prevention efforts match the threat the United States faces continues to be central in policy debate. One element of this debate is questioning whether the United States should create a dedicated domestic intelligence agency. Case studies of five other democracies--Australia, Canada, France, Germany, and the UK--provide lessons and common themes that may help policymakers decide. The authors find that* most of the five countries separate the agency that conducts domestic intelligence gathering from any arrest and detentio