How the U.S. Government Obtains and Uses Cellphone Location Data | WSJ

The U.S. government is using app-generated marketing data based on the movements of millions of cellphones around the country for some forms of law enforcement. We explain how such data is being gathered and sold. Illustration: Laura Kammermann More from the Wall Street Journal: Visit WSJ.com: http://www.wsj.com Visit the WSJ Video Center: https://wsj.com/video On Facebook:   / videos   On Twitter:   / wsj   On Snapchat: https://on.wsj.com/2ratjSM #WSJ #Explainer