Court of Appeals says NSA tracking your movements using this kind of data from without a warrant is unconstitutional.

The United States v. Davis case is important because it provides substantive and procedural protections against abuse of an increasingly common, highly invasive government surveillance method – cell phone tracking.

* The Davis decision suggests that the U.S. government’s collection of all kinds of business records and transactional data — commonly called “metadata” — for law enforcement and national security purposes may also be unconstitutional.

* The Court of Appeals concluded that under the “reasonable expectation of privacy” test, location information is Fourth Amendment protected.

This is great privacy news for anyone who uses a cell phone. This suggests that when appellate courts finally get hold of the NSA’s bulk metadata collection programs, these programs may very well be knocked down.

[Read more.](http://www.wired.com/2014/06/davis-undermines-metadata)