An in-depth look at the border fence debate

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A Border Patrol vehicle sits along the border fence separating Nogales, Ariz., and Nogales, Sonora, Mexico,  Wednesday, July 28, 2010. Arizona's new immigration law SB1070 takes effect Thursday, July 29. (AP Photo/Jae C. Hong) By Jae C. Hong A Border Patrol vehicle sits along the border fence separating Nogales, Ariz., and Nogales, Sonora, Mexico, Wednesday, July 28, 2010. Arizona's new immigration law SB1070 takes effect Thursday, July 29. (AP Photo/Jae C. Hong) By Jae C. Hong

PHOENIX -- Debate has swirled for years around the building a massive fence along the U.S.-Mexico border.

Supporters say it would slow the flow of illegal immigrants coming into our country.

Critics say it's a multi-billion dollar failure that's been plagued by problems from the beginning.

Gary Tuchman reports.