Philly hosted arguments on legality of warrantless cell phone tracking -- Via CNET News [Quote]
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Cell phone tracking comes in two forms: police obtaining retrospective historical data kept by mobile providers for their own billing purposes that is typically not very detailed, or prospective tracking--which CNET was the first to report in a 2005 article--that reveals the minute-by-minute location of a handset or mobile device.. . .
The Obama administration argues that no search warrant is necessary; it says what's needed is only a 2703(d) order, which requires law enforcement to show that the records are "relevant and material to an ongoing criminal investigation." Because that standard is easier to meet than that of a search warrant, it is less privacy-protective.
The Third Circuit Court of Appeals in Philadelphia heard oral arguments on Friday, 12 February 2010 about the legality of the government demanding cell tracking records from service providers.
As I understand it, the government has been asserting authority under a very loose statutory provision allowing them to get these records without a search warrant, requiring only that the records be shown "relevant" to an ongoing investigation.
The records used are produced when your cell phone company pings your phone, which it does at regular intervals (sometimes less than two minutes apart), to determine which cell tower is closest to you.
The phone company uses that data to ensure that incoming and outgoing calls are routed to the nearest tower, resulting in the clearest signal and the fewest possible dropped calls.
The government can use it to triangulate your position to within 150 meters (less than 500 feet).
That's enough to know when you're at home and in many large buildings, like churches and employer offices, and that level of accuracy without the requirement for a warrant showing probable cause concerns many privacy advocates and clearly does not sit well with the presiding judge in the Third Judicial Circuit's Court of Appeals, Judge Sloviter.
Read the excerpts of the argument transcript that CNET included in their article (particularly the section they end the article with) and you'll know what I mean.
Third Judicial Circuit's website: