If you are following the letter of the law in 2011, I agree with john. You need a neutral there. I am not sure how you deal with having more than one feed into a location. Again the letter of the law will require a separate neutral for all of them.
We are still on 2008. I have not seen this litigated.
It seems the "switch loop" as we know it is gone. From a practical sense you need to feed through switching locations, not down and back.
