November 16, 2010 12:19 PM

Illegal immigration crackdowns can backfire

Brian Poulsen fought on the front lines of America's war against illegal immigration for three decades. He patrolled the border near San Diego on horseback, grew a ragged beard to disguise himself as a human smuggler, arrested and deported thousands of illegal immigrants, and tracked down fake document vendors at local flea markets. But Poulsen and other agents have discovered it's not easy to enforce immigration laws — especially those that target employers. Aggressive crackdowns can backfire if they hurt business.

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