Courts around the U.S. are grappling with how to balance law enforcement's use of GPS data with an individual's right to privacy. A district judge in Maryland recently denied a warrant requested by federal authorities who were attempting to locate a suspect via his cellphone's GPS data. The judge said that for some, "this use of location data...would appear chillingly invasive." Meanwhile, courts in California and Oregon have upheld warrantless GPS searches by authorities, and the U.S. Supreme Court will review a GPS privacy case, The Baltimore Sun reports. "For investigators, the cellphone has become one of the greatest tools available," says one expert. "But certainly we want to do this the right way and protect people's right to privacy."   
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