WASHINGTON (AP) — The administration's plan to use technology and physical barriers to keep people from illegally entering the country is back on track this week.

A virtual fence along a 28-mile stretch of Arizona will get the government's conditional stamp of approval today, allowing it to move into the next testing phase.

Earlier this year Homeland Security Secretary Michael Chertoff withheld partial payment to contractor Boeing Co. because the technology the company used in a pilot project near Tucson, Ariz., did not work properly.