Yes, no doubt then you are correct, however that is why I said often and not always. It seems to have to do with whether there are co-drivers or not.
You may wish to check out
http://argent.fia.com/web/fia-public.nsf/524E3B3747A94B3AC125730F00509B07/$FILE/AppJ_Art_253.pdf?Openelement
section 8 for options
Cheers
smbrm