WASHINGTON — Each year, federal agents peek at the financial transactions of millions of Americans — without their knowledge.

The same type of information that raised suspicions about New York Gov. Eliot Spitzer is reviewed every day by authorities to find traces of money laundering, check fraud, identity theft or any crime that may involve a financial institution.

As concerns about fraud and terrorist financing grow, an increasing number of suspicious deposits, withdrawals and money transfers are being reported by banks and others to the federal government. Banks and credit unions as well as currency dealers and stores that cash checks reported a record 17.6 million transactions to the Financial Crimes Enforcement Network in 2006, according to a report from the network, a bureau of the U.S. Treasury Department.

"I don't think Americans understand that their financial transactions are being reported and routinely examined," said Barry Steinhardt of the American Civil Liberties Union.

The Treasury Department's database now contains records of more than 100 million financial transactions going back to at least 1996, said network spokesman Steve Hudak.

Teams of agents from the FBI, IRS, Drug Enforcement Administration and other agencies regularly review newly filed financial reports and launch investigations. Federal and local authorities search the database to find information about people that can help ongoing probes. Treasury Department analysts study the reports to detect trends in fraud and issue reports alerting financial institutions.

"The government has access to untold volumes of records and can draw all sorts of conclusions about us, and many are going to be wrong," Steinhardt said.

Bankers disagree. "For the typical bank customer, this means very little because there's nothing they're doing that's likely to be viewed as out of the ordinary," said Richard Riese, head of regulatory compliance for the American Bankers Association.

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