Ever since the Snowden leaks, the public has been exposed to a constant stream of revelations about how authorities use technology to spy upon us. For instance, the ACLU found that stingray devices were used 47 times by police in Erie County, New York, but only got the court's permission once. For those not in the know, a stingray is a fake cellphone tower that sucks up all the mobile traffic in the immediate region, making them perfect for spying on all of a city block's residents at the same time.
The paper cites an example from Baltimore, where officers are normally required to obtain a court order to get a person's cellphone details. However, there's also a shortcut if the information is time sensitive, enabling them to request from the phone company directly under the auspices of it being an emergency. You'll win no prizes for guessing which process is more frequently used, with one anonymous source describing a deluge of requests along the emergency back door channel.
The road to restoring the public's trust will be a long one, but there are some reasons to be optimistic, at least. The paper has noted that the FBI is no longer simply snatching people's information without permission, but is now submitting requests for search warrants to judges. That should provide some much-needed oversight to what has previously been an unsupervised process, and let's just hope that some more agencies remember to abide by due process.