> Which means also we can expect a lot more false positives.
Perhaps we can, but clearly we can expect to find actual UAVs corresponding to these radar signals.
If these UAVs that have been shot down were domestic research balloons or some other aircraft exempt from FAA regulation, then we can expect a party to come forward and publicly acknowledge ownership/control of the UAV.
However, based on the descriptions of the object over Alaska it seems very likely there are indeed unmanned drones being operated by foreign governments and not domestic weather/research balloons or FAA compliant unregistered domestic aircraft.