A game warden told me once to use this as a guideline:
Bait = "Natural or unnatural food sources that have been put down by a person in a place where that food source would not exist had it not been for the actions of the person." He told me he asks that question to himself and the hunter when he comes upon a situation that is questionable.

Doe pee and other scents are considered attractants where I am from and they are legal - I would think they would be legal in NC as well because a deer isn't going to consume doe pee.

Finally, use your own conscious - if it seems wrong it probably is wrong.