Can a mobile app track a user using GPS/location services running in the background, and do something when a user is found in a particular location? Assuming that the app clearly tells the user that it will do this?
A colleague said that this is illegal because there is a court ruling that no one (software/app) can track a user's location in the background, but rather can only use location when the user is actively using the app. Is this correct?
After googling I found one ruling that "warrantless tracking is not allowed." Is this applicable?