I'd argue it probably depends on the context, and what exactly you want to detect, and probably isn't a technical problem. For example, if you prevent students

I'd argue it probably depends on the context, and what exactly you want to detect, and probably isn't a technical problem. For example, if you prevent students from cheating, that's probably a problem specific to education. If you want to know whether a student's essay are their own words, you can ask them questions about their essay. You can have them verbally defend their arguments and research. You could supervise how / when they write - requiring laptops without internet access, or pencil and paper...