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The FBI’s Criminal Justice Information Services [underground] building in Clarksburg [West Virginia] houses a multibillion-dollar computer system that processes 600 billion fingerprint sets a day...Agents in the field use wireless scanners to transmit fingerprint samples to the center, where matches can be returned as quickly as seven seconds. The facility also processes fingerprint searches on travelers scanned at border entry points under the U.S. Visit program, as well as on teachers, day-care center employees, government workers and others who must undergo background checks for their jobs.