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In post-9/11 America, preventing the next terrorist attack ranks as law enforcement's top priority. This is as true for local police departments as it is for the FBI. This has led many advocates of stronger enforcement of U.S. immigration law to recast their efforts as anti-terrorism campaigns. As part of this endeavor, these advocates have called for local police to become involved in enforcing immigration law, and their allies in both the executive and legislative branches of the federal government have taken a number of actions designed to force local police to do this. Surprisingly, local law enforcement has for the most part vehemently refused to accept this new responsibility, saying that becoming involved in immigration enforcement will actually make the public not safer, but less safe, from criminals and even from terrorists. The reasons for this have much to do with the success of community policing over the last twenty years. Thus the refusal of state and local law enforcement to become involved in immigration enforcement both illuminates a turning point in American policing, and teaches us important lessons in how we must go forward in the war on terror if we are to succeed.