A U.S. Border Patrol agent monitors the "border-fence" area along the U.S.-Mexico border between the Otay Mesa and San Ysidro ports of entry near San Diego.
California shares a 140-mile border with Mexico -- and the new federal immigration bill requires the Department of Homeland Security to give Congress a plan for controlling it. But some experts question the emphasis on border security, saying the Mexican border is more secure today than it has ever been. Reporter: Scott Shafer
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