Yep there were quite a few alphabet agencies as well as idiots who dont understand civil liberties ranting about how awful it was that Apple wouldnt help crack iphone encryption of the San Bernadino shooters. Apple knew it would be a major security breach if they helped and put the rest of us at risk of unreasonable searches. Whats next?
I read a bit recently about so called 'geofencing' subpoenas ramping, where police agencies short of other leads on a crime subpoena metadata about what phones etc were in the area of the scene around the time of the crime
IMO too new to have been seriously tested via the courts, police agencies of course interpretting it as legal because data doesn't have personally identifying information - at least not until they identify an 'account of interest' and go after the personal data
Would seem to have major fourth amendment issues