Come on, it would be pretty simple to do with even pretty conservative metrics: abrupt lane changes without indicating, frequent rapid acceleration and deceleration and swerving, if the car has cameras, then proximity to other vehicles or pedestrians while driving at speed, i.e. tailgating etc., if the car has gps, then failing to stop at intersections with stop signs, getting from A to B in a time that could only have been achieved with excessive speeding...