In a ruling applying individual constitutional protections to new technology, the Supreme Court on Monday ruled that sweeping use of cell phone location data requires a warrant.

Supreme Court held Monday that constitutional privacy protections extend to cellphone location information, ruling in the case of a bank robber whose identity was discovered through a geofence warrant...

Justice Elena Kagan wrote the majority opinion, which held that the sensitive data scooped up by “geofence warrants” counts as a fourth amendment search, and offers individuals a “reasonable expectati...