I am international myself and have seen international students cheating before. In one (really bad, no one cares) course that I took as an undergrad, everyone cheated. I was the only one who came to class and didn't cheat (or didn't know that you could cheat in that course). It was, perhaps not noble, but not rare for students (American + non-American) to pass on their exams to the next class and professors discuss how to deter that too.