Law enforcement agencies are using a new surveillance device, but can only purchase it by signing an NDA.
Certain corners of the Internet have been up in arms around the StingRay police device—allegedly a cell-tower-in-a-van that can scoop up calls, texts, and phone data for police use. But that's all we know: To buy the device, police departments must sign a nondisclosure agreement to refrain from sharing any of its operational details, according to The New York Times.