“Big Brother is watching you” is no longer a fictional admonition. Your location is recorded wherever you go — by phone technology, license-plate readers, Uber transactions and cameras everywhere . That puts evidence of your personal movements in the hands of tech companies you may never even have heard of. Can the police and other government agencies force those companies to share that information? That was the question before the US Supreme Court this week, in a case that could impact your privacy. If your location history puts you in the vicinity of a crime, for example, you may become a suspect, swept up in the wide net cast to find the perpetrator. Law enforcement is increasingly using this tech, called geofencing, to pursue crimes that could otherwise go unsolved.  During Monday’s oral arguments in Chatrie v.…