While it's definitely an ethical situation, it might be a bit touchy for the interview. You don't want to mar your interview incase the interviewer personally strongly disagrees with your stance. Though if you get asked it, and it's the only thing you can think of, just be careful of how you go about it. The impression I got when I was asked a similar question at my interviews was that they were looking for things like cheating/plagiarism, not necessarily on your part, or if you had encountered anything in your shadowing or other experiences.