My observation hanging out with friends of different nationalities was that foreigners are a lot more susceptible to plagiarizing than someone who went through the American HS system. Almost all my Indian friends who came here just for college ran into some kinda trouble with plagiarizing. The last time I got into trouble for it was in 6th grade when an entire assignment was scrapped because given the few online resources for the topic, almost everyone had the same paper. This was late 90s and the teacher gave us am earful about how we cannot be doing this and the seriousness of the offense. Sometimes I feel my counterparts in other parts of the world don't get this lesson until their first offense at an American college. Good percentage of my friends who got caught end up going to med school or getting degrees far more advanced than mine leading me to rule out that plagiarism is a strong indicator of longterm failure.