How exactly do we know it was in checked luggage vs carry on luggage compartment. Without tools, its not exactly easy to point-point a Bluetooth signal. Nor ar

How exactly do we know it was in checked luggage vs carry on luggage compartment. Without tools, its not exactly easy to point-point a Bluetooth signal. Nor are passengers meant to be roaming around the aircraft whilst in flight (i.e to access carry on luggage compartment and turn it off).