Submission + - Secrets of FBI Smartphone Surveillance Tool Revealed in Court Fight (wired.com)
The government has long asserted that it doesn’t need to obtain a probable-cause warrant to use the devices because they don’t collect the content of phone calls and text messages and operate like pen-registers and trap-and-traces, collecting the equivalent of header information.
The government has conceded, however, that it needed a warrant in his case alone — because the stingray reached into his apartment remotely to locate the air card — and that the activities performed by Verizon and the FBI to locate Rigmaiden were all authorized by a court order signed by a magistrate.