NYT: Live Tracking of Mobile Phones Prompts Court Fights on Privacy

Live Tracking of Mobile Phones Prompts Court Fights on Privacy

December 10, 2005
By MATT RICHTEL


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.

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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.)

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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.

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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.

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"The distinction between cell site data and information gathered by a tracking device has practically vanished," wrote Judge Smith. He added that when a phone is monitored, the process is usually "unknown to the phone users, who may not even be on the phone."

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