A federal appeals court has overruled the Obama administration’s appeal of a case challenging the constitutionality of the U.S. government’s use of cell phone records to track the movements of suspects or persons of interest in investigations. Investigators have been able to identify an individual’s movements and locations based on GPS technology in many cell phones or the nearby phone towers used to beam a given call. The Third Court of Appeals ruled that warrants may be required earlier this year, and a full panel reaffirmed the judgment this week.