Why Cant they just build this fence ?

http://www.msnbc.msn.com/id/23382776/

Physical fence also delayed?
The virtual fence was to complement a physical fence that the administration now says will include 370 miles of pedestrian fencing and 300 miles of vehicle barriers to be completed by the end of this year. The GAO said this portion of the project may also be delayed and that its total cost cannot be determined. The president's 2009 budget does not propose funds to add fencing beyond the 700 or so miles meant to be completed this year.

"The total cost is not yet known," testified Richard M. Stana, the GAO's director of homeland security issues, because DHS officials "do not yet know the type of terrain where the fencing is to be constructed, the materials to be used, or the cost to acquire the land."

The pilot virtual fence included nine mobile towers, radar, cameras, and vehicles retrofitted with laptops and satellite phones or handheld devices. They were to be linked to a near-real-time, maplike projection of the frontier that agents could use to track targets and direct law enforcement resources.

GAO investigators said that Boeing's software could not process large amounts of sensor data. The resulting delays made it hard for operators in a Tucson command center 65 miles to the north to lock cameras on targets. Radar systems were also triggered inadvertently by rain and other environmental factors. Cameras had trouble resolving images at five kilometers when they were expected to work at twice that distance, Stana said.

He added that the system was developed with "minimal input" from Border Patrol agents, resulting in an unworkable "demonstration project" instead of a operating pilot system. He blamed the DHS for acting too hastily in trying to deliver a working pilot by last June.

The effort produced "a product that did not fully meet user needs, and the project's design will not be used as the basis for future . . . development," Stana testified, adding that the DHS plans to replace most of the components. The Wall Street Journal said Saturday that Boeing's pilot project will not be replicated.