Chatrie v. United States asks what limits the Constitution places on the surveillance state in an age of cellphones.

The case involves Fourth Amendment protection against unreasonable searches.

Alfred Ng was a senior reporter for CNET News. He was raised in Brooklyn and previously worked on the New York Daily News's social media and breaking news teams. On Aug. 5, a judge's order ruled that ...

Google tracks the vast majority of cellphones in the United States, collecting your location, usage and device data through installed software and apps. The tracking occurs by various autonomous ...

The justices were concerned that the Trump administration is asking for too much in a major police surveillance case.

The justices’ decision on whether police can use location history data to track suspects may redefine Fourth Amendment protections in the digital age. While the court battle between Elon Musk and ...

Geofence warrants give cops leads but create false positives and have spurred legal challenges.

Does the 4th Amendment's ban on unreasonable searches extend to your smartphone and its tracking data?