There are currently no firm standards on the kinds of Fourth Amendment protections that should apply to cell phone tracking data. This is becoming an issue as GPS and other tracking technologies have been added to cell phone to satisfy E911 requirements, and as police agencies have discovered the potential benefits of mobile-phone location data.
warrants
EFF's warrantless wiretapping case dismissed
A federal judge has dismissed Jewel v. NSA, a case from the Electronic Frontier Foundation (EFF) on behalf of AT&T customers challenging the National Security Agency’s mass surveillance of millions of ordinary Americans’ phone calls and emails.