I didn't want to leave my camera in the truck while I was in the store the other day, and, I just went up to the front host, and, told him I had the camera. He asked me a couple of questions, asked me not to take any photos (which I had no intentions of doing), and, that was that. So, I don't think photos are allowed in the store, but, you might be able to ask permission and have an exception made. But, you can get your point across without even having to display the walmart logo or even show the building. Good luck, let us know how it turns out. I think it's a cool assignment, as it does seem to be a topic of discussion in america right now.