The Bush administration wants immigration reform, and it will test a critical element of its program along the Arizona border with Mexico. The government will evaluate the first 28-mile-long section of an electronic 'virtual fence.' This fence is designed to seal the border between Mexico and the United States. The first set of camera towers was built by Boeing Company. These towers, which as 98 feet tall, will provide the Homeland Security Department with a 24-hour view of anyone trying to cross into the United States illegally. The ability of this test project to perform as promised could have a critical impact on the future of immigration reform measures currently being discussed in Congress. Passage of immigration reform measures will depend in part on convincing skeptical Republican lawmakers that they should accept promises from the administration that it will have the ability to police the borders effectively by the end of 2008. President Bush has proposed diverting $4.4 billion in fees and penalties to improving border security and increasing enforcement of workplace immigration laws. Some of these funds would be put toward initiatives like the virtual fence. There are critics of Bush's fence plan, however. T.J. Bonner, president of the U.S. Border Patrol agents' union, says that fences of any kind do not stop immigrants. Only law enforcement agents can do that, he says. Agents are concerned that well-financed drug cartels will just create or buy technology to subvert the virtual fencing system.