I wonder if there can be nuance that if a person owns a private location, they can request the data for their property. This seems reasonable to me. The only people on the property should have permission and already be known to the owner. The ones who don't are trespassing and can be suspects for crimes committed during that time.
"You'd need geofencing of mobiles to be precise and accurate to about a meter for that to work."
That's not true. There are many types of properties. Large properties could accomodate large margins of error, multiple times greater than the fine grain location data when using a poont in the middle of the property. There are some types of properties that this couldn't be applied to, such as apartments.
