That is the correct behavior. If your hands are not required to impart measurable torque, then it'd be easy to spoof and would lead to more false negatives. So

That is the correct behavior. If your hands are not required to impart measurable torque, then it'd be easy to spoof and would lead to more false negatives. So you're suggesting this was a false negative, i.e. that the driver did have his hands on the wheel?