Homeland Security: US-Mexico virtual fence set for go ahead

The U.S. government is set to approve a 28-mile virtual fence along the U.S.-Mexico border in Arizona, according to Homeland Security Secretary Michael Chertoff.

AP reports the virtual fence includes 98-foot unmanned towers that are equipped with an array of sophisticated technology including radar, sensor devices and cameras capable of distinguishing people from cattle at a distance of about 10 miles.