Netflix dvd

Not sure if netflix rents its dvd's without DD or DTS layers.
Just tried to watch dark knight rises and no 5.1 layer to be found.Does anyone know this to be true,i'm a new member, if it is they lost me for mail order.
I couldn't get the DD or any other multitrack out of it. I had to use a simulated format which isn't that good. I popped my copy of waterworld in and DD popped right up on my Marantz 7005 pre, so my settings were correct. Looks like i'm back to redbox, no problems there, yet