“Big Brother is watching you” is no longer a fictional admonition. Everywhere you go, your location is recorded by phone technology, license plate readers, Uber and Lyft transactions, and cameras. Privacy? Forget about it. Your location history is in the hands of many tech companies. Can the police and other government agencies force tech companies to share that information about you? The U.S. Supreme Court took up that question on Monday. The court’s decision could have a widespread impact on your privacy. If your location history puts you within a 1-mile radius of a bank robbery with hundreds of...