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"Bigger. Faster. Better. That's the bottom line," said Thomas E. Bush III, assistant director of the FBI's Criminal Justice Information Services Division, which operates the database from its headquarters in the Appalachian foothills.

The increasing use of biometrics for identification is raising questions about the ability of Americans to avoid unwanted scrutiny. It is drawing criticism from those who worry that people's bodies will become de facto national identification cards. Critics say that such government initiatives should not proceed without proof that the technology really can pick a criminal out of a crowd.

The use of biometric data is increasing throughout the government. For the past two years, the Defense Department has been storing in a database images of fingerprints, irises and faces of more than 1.5 million Iraqi and Afghan detainees, Iraqi citizens and foreigners who need access to U.S. military bases. The Pentagon also collects DNA samples from some Iraqi detainees, which are stored separately.

The Department of Homeland Security has been using iris scans at some airports to verify the identity of travelers who have passed background checks and who want to move through lines quickly. The department is also looking to apply iris- and face-recognition techniques to other programs. The DHS already has a database of millions of sets of fingerprints, which includes records collected from U.S. and foreign travelers stopped at borders for criminal violations, from U.S. citizens adopting children overseas, and from visa applicants abroad. There could be multiple records of one person's prints.

"It's going to be an essential component of tracking," said Barry Steinhardt, director of the Technology and Liberty Project of the American Civil Liberties Union. "It's enabling the Always On Surveillance Society."

If successful, the system planned by the FBI, called Next Generation Identification, will collect a wide variety of biometric information in one place for identification and forensic purposes.

In an underground facility the size of two football fields, a request reaches an FBI server every second from somewhere in the United States or Canada, comparing a set of digital fingerprints against the FBI's database of 55 million sets of electronic fingerprints. A possible match is made -- or ruled out--as many as 100,000 times a day.

Soon, the server at CJIS headquarters will also compare palm prints and, eventually, iris images and face-shape data such as the shape of an earlobe. If all goes as planned, a police officer making a traffic stop or a border agent at an airport could run a 10-fingerprint check on a suspect and within seconds know if the person is on a database of the most wanted criminals and terrorists. An analyst could take palm prints lifted from a crime scene and run them against the expanded database. Intelligence agents could exchange biometric information worldwide.

More than 55 percent of the search requests now are made for background checks on civilians in sensitive positions in the federal government, and jobs that involve children and the elderly, Bush said. Currently those prints are destroyed or returned when the checks are completed. But the FBI is planning a "rap-back" service, under which employers could ask the FBI to keep employees' fingerprints in the database, subject to state privacy laws, so that if that employees are ever arrested or charged with a crime, the employers would be notified.

Advocates say bringing together information from a wide variety of sources and making it available to multiple agencies increases the chances to catch criminals. The Pentagon has already matched several Iraqi suspects against the FBI's criminal fingerprint database. The FBI intends to make both criminal and civilian data available to authorized users, officials said. There are 900,000 federal, state and local law enforcement officers who can query the fingerprint database today, they said.