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Live Tracking of Mobile Phones Prompts Court Fights on Privacy

http://www.nytimes.com/2005/12/10/technology/10phone.html?ei=5065&en=a2a07f37

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By MATT RICHTEL
Published: December 10, 2005
Most Americans carry cellphones, but many may not know that government agencies can track their movements through the signals emanating from the handset.

In recent years, law enforcement officials have turned to cellular technology as a tool for easily and secretly monitoring the movements of suspects as they occur. But this kind of surveillance - which investigators have been able to conduct with easily obtained court orders - has now come under tougher legal scrutiny.

In the last four months, three federal judges have denied prosecutors the right to get cellphone tracking information from wireless companies without first showing "probable cause" to believe that a crime has been or is being committed. That is the same standard applied to requests for search warrants.

The rulings, issued by magistrate judges in New York, Texas and Maryland, underscore the growing debate over privacy rights and government surveillance in the digital age.

With mobile phones becoming as prevalent as conventional phones (there are 195 million cellular subscribers in this country), wireless companies are starting to exploit the phones' tracking abilities. For example, companies are marketing services that turn phones into even more precise global positioning devices for driving or allowing parents to track the whereabouts of their children through the handsets.

Not surprisingly, law enforcement agencies want to exploit this technology, too - which means more courts are bound to wrestle with what legal standard applies when government agents ask to conduct such surveillance.

Cellular operators like Verizon Wireless and Cingular Wireless know, within about 300 yards, the location of their subscribers whenever a phone is turned on. Even if the phone is not in use it is communicating with cellphone tower sites, and the wireless provider keeps track of the phone's position as it travels. The operators have said that they turn over location information when presented with a court order to do so.

The recent rulings by the magistrates, who are appointed by a majority of the federal district judges in a given court, do not bind other courts. But they could significantly curtail access to cell location data if other jurisdictions adopt the same reasoning. (The government's requests in the three cases, with their details, were sealed because they involve investigations still under way.)

"It can have a major negative impact," said Clifford S. Fishman, a former prosecutor in the Manhattan district attorney's office and a professor at the Catholic University of America's law school in Washington. "If I'm on an investigation and I need to know where somebody is located who might be committing a crime, or, worse, might have a hostage, real-time knowledge of where this person is could be a matter of life or death."

Prosecutors argue that having such information is crucial to finding suspects, corroborating their whereabouts with witness accounts, or helping build a case for a wiretap on the phone - especially now that technology gives criminals greater tools for evading law enforcement.

The government has routinely used records of cellphone calls and caller locations to show where a suspect was at a particular time, with access to those records obtainable under a lower legal standard. (Wireless operators keep cellphone location records for varying lengths of time, from several months to years.)

But it is unclear how often prosecutors have asked courts for the right to obtain cell-tracking data as a suspect is moving. And the government is not required to report publicly when it makes such requests.

Legal experts say that such live tracking has tended to happen in drug-trafficking cases. In a 2003 Ohio case, for example, federal drug agents used cell tracking data to arrest and convict two men on drug charges.

Mr. Fishman said he believed that the number of requests had become more prevalent in the last two years - and the requests have often been granted with a stroke of a magistrate's pen.

Prosecutors, while acknowledging that they have to get a court order before obtaining real-time cell-site data, argue that the relevant standard is found in a 1994 amendment to the 1986 Stored Communications Act, a law that governs some aspects of cellphone surveillance
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