A U.S. government office in Quantico, Virginia, has direct, high-speed access to a major wireless carrier's systems, exposing customers' voice calls, data packets and physical movements to uncontrolled surveillance, according to a computer security consultant who says he worked for the carrier in late 2003.

According to his affidavit, Pasdar tumbled to the surveillance superhighway in September 2003, when he led a "Rapid Deployment" team hired to revamp security on the carrier's internal network. He noticed that the carrier's officials got squirrelly when he asked about a mysterious "Quantico Circuit" -- a 45 megabit/second DS-3 line linking its most sensitive network to an unnamed third party.

Quantico, Virginia, is home to a Marine base. But perhaps more relevantly, it's also the center of the FBI's electronic surveillance operations.

"The circuit was tied to the organization's core network," Pasdar writes in his affidavit. "It had access to the billing system, text messaging, fraud detection, web site, and pretty much all the systems in the data center without apparent restrictions."