https://www.reuters.com/article/us-usa-court-mobilephone/u-s-top-court-rules-warrants-required-for-cellphone-location-data-idUSKBN1JI1WT

The U.S. Supreme Court on Friday imposed limits on the ability of police to obtain cellphone data pinpointing the past location of criminal suspects in a major victory for digital privacy advocates and a setback for law enforcement authorities.