I judged at some robotics competitions where we interviewed the students. It was usually immediately apparent if the student had not done the work, and as a res

I judged at some robotics competitions where we interviewed the students. It was usually immediately apparent if the student had not done the work, and as a result they would not receive an award. I think that's the only way to do it. The student must be able to describe the work they did. A fraudster might still get through with sufficient coaching.