This is why the US needs strong privacy laws, and prior to that guidance to law enforcement agencies on 4th amendment protections.

Fog Reveal is a service marketed to law enforcement agencies to track users throughout their days via access to a clearinghouse of data from smartphone apps. Did you give the weather app your location? Prepare to be tracked. Any other app, social media, etc.? You are in the system. My guess is that if you don't allow the app to access location data, but you have a store's app on your phone, and they see your Bluetooth in the store …

guidance law law enforcement laws privacy privacy laws