The NYPD is one of many police departments across the country quietly using a highly secretive military grade technology that can track the whereabouts of suspects by using their cell phone signals.

Civil liberties and privacy groups are increasingly raising objections to the suitcase-sized devices known as StingRays or cell site simulators that can sweep up cell phone data from an entire neighborhood by mimicking cell towers. Police can determine the location of a phone without the user even making a call or sending a text message. Some versions of the technology can even intercept texts and calls, or pull information stored on the phones.

Part of the problem, privacy experts say, is the devices can also collect data from anyone within a small radius of the person being tracked. And law enforcement goes to great lengths to conceal usage, in some cases, offering plea deals rather than divulging details on the StingRay.

“We can’t even tell how frequently they’re being used,” said attorney Jerome Greco, of the Legal Aid Society, which recently succeeded in blocking evidence collected with the device in a New York City murder case. “It makes it very difficult.”

At least 72 state and local law enforcement departments in 24 states plus 13 federal agencies use the devices, but further details are hard to come by because the departments that use them must take the unusual step of signing nondisclosure agreements overseen by the FBI.

An FBI spokeswoman said the agreements, which often involve the Harris Corporation, a defense contractor that makes the devices, are intended to prevent the release of sensitive law enforcement information to the general public. But the agreements don’t prevent an officer from telling prosecutors the technology was used in a case.

Here in New York, use of the technology was virtually unknown to the public until last year when the New York Civil Liberties Union forced the disclosure of records showing the NYPD used the devices more than 1,000 times since 2008. That included cases in which the technology has helped catch suspects in kidnappings, rapes, robberies, assaults and murders. It has even helped find missing people. But privacy experts say such gains come at too high a cost.

“We have a Fourth Amendment to the Constitution,” said Jennifer Lynch, an attorney with the Electronic Frontier Foundation, referring to the protection against unreasonable search and seizure. “Our Founding Fathers decided when they wrote the Bill of Rights there had to be limits placed on government.”

Lawmakers in several states have introduced proposals ranging from warrant requirements to an outright ban on the technology; about a dozen states already have laws requiring warrants. Federal law enforcement said last year that it would be routinely required to get a search warrant before using the technology — a first effort to create a uniform legal standard for federal authorities.

And case law is slowly building. Two months ago, a Washington, D.C., appeals court overturned a conviction on a sex assault after judges ruled a violation of the Fourth Amendment because of evidence improperly collected from the simulator without a proper warrant.

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