We checked into it when we first had Scarlet & it is legal in all states as far as i know but i still wouldn't put her in it because it just felt unsafe to me, But that's just my opinion!
If there is a passenger airbag in the seating position occupied by a child using a car seat, it is recommended that the seat be moved as far back as possible while still allowing correct seat belt fit.
If there is a passenger airbag in the seating position occupied by the child, you must not use a rearward facing infant restraint.
The information we got said it was illegal if the vehicles had airbags at all, But i'm in Qld.