In more than six years of spying on Muslim neighborhoods, eavesdropping on conversations and cataloging mosques, the New York Police Department's secret Demographics Unit never generated a lead or triggered a terrorism investigation, the department acknowledged in just-unsealed court testimony.

The Demographics Unit is at the heart of a police spying program, built with help from the CIA, which assembled databases on where Muslims lived, shopped, worked and prayed. Police infiltrated Muslim student groups, put informers in mosques, monitored sermons and cataloged every Muslim in New York who adopted new, Americanized surnames.

Police hoped the Demographics Unit would serve as an early warning system for terrorism. And if police ever got a tip about, say, an Afghan terrorist in the city, they'd know where he was likely to rent a room, buy groceries and watch sports.

But in a June 28 deposition as part of a long-standing federal civil rights case, unsealed late Monday, Assistant Chief Thomas Galati said none of the conversations the officers overheard ever led to a case.

"Related to Demographics," Galati testified that information that has come in "has not commenced an investigation."

The NYPD is the largest police department in the nation, and Mayor Michael Bloomberg has held up its counterterrorism tactics as a model for the rest of the country. After the AP began reporting on those tactics last year, supporters argued that the Demographics Unit was central to keeping the city safe.

Galati testified that it was an important tool, but conceded it had not generated any leads. "I never made a lead from rhetoric that came from a Demographics report, and I'm here since 2006," he said. "I don't recall other ones prior to my arrival. Again, that's always a possibility. I am not aware of any."

Galati, the commanding officer of the NYPD Intelligence Division, offered the first official look at the Demographics Unit, which the NYPD denied ever existed when it was revealed by The Associated Press last year. He described how police gather information on people even when there is no evidence of wrongdoing, simply because of their ethnicity and native language.

As a rule, Galati said, a business can be labeled a "location of concern" whenever police can expect to find groups of Middle Easterners there.

Galati testified as part of a lawsuit that began in 1971 over NYPD spying on students, civil rights groups and suspected Communist sympathizers during the 1950s and 1960s. The lawsuit, known as the Handschu case, resulted in federal guidelines that prohibit the NYPD from collecting information about political speech unless it is related to potential terrorism.

Civil rights lawyers believe the Demographics Unit violated those rules. Documents obtained by the AP show the unit conducted operations outside its jurisdiction, including in New Jersey. The FBI there said those operations damaged its partnerships with Muslims and jeopardized national security.

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