Babies often fall asleep during drive and because they often don't move an inch or cry when a driver exit either.
Sure, makes sense. You could then add weight of empty car seat vs non empty car seat for defense in depth.
Or a thermal sensor/heartbeat sensor would make it “foolproof”? (Maybe not a good thing).
It would be off topic but I think best cba/cea for reducing needless fatalities would be preventing steering from drunk drivers.