U.S. Border Patrol checkpoints near the Mexican border are essential in stopping the flow of illegal aliens and drugs into America, say law-enforcement authorities, but permanent checkpoints in southern Arizona are not allowed. While Border Patrol agents in Arizona accounted for more than half of the 1.15 million illegals caught last year, Congress -- led by Rep. Jim Kolbe, Arizona Republican -- steadfastly has approved appropriation bills that prohibit permanent checkpoints along a 260-mile section of the Arizona border known as the Tucson sector. Tucson is the only one of 20 Border Patrol sectors nationwide not permitted to set up...