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)

Photo 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)