It's no secret that local law enforcement offices around the US are using a tool called Stingray to track cellphone locations without the approval of a judge. In response to a Freedom of Information Act request from MuckRock's Alex Richardson, the FBI released thousands of pages of heavily-redacted documents, emails and more concerning the project, including one titled "Cellphone Tracking for Dummies." The super secret Stingray device is provided to local authorities by the FBI, creating fake cell towers that force nearby handsets to connect to it -- even those belonging to folks other than a suspect. And as you might expect, in addition to tracking, it also reveals the identity of the phone's owner. Included in the collection is loads of correspondence between the Bureau, Boeing, the Harris Corporation and local law enforcement. Those two middle companies, by the way, are manufacturers of the tech.