If I was a professor, I would make a very clear policy they AI is not to be used on assignments, and would repeat it throughout the semester, but make no effort

If I was a professor, I would make a very clear policy they AI is not to be used on assignments, and would repeat it throughout the semester, but make no effort to actually enforce this and even make it easy to abuse. Then, for the final exam, drop the bomb: in person, handwritten, no outside references, mostly the same assignments we’ve done before. If you fail, it’s over for you. If you stayed true and studied, it should be easy for you to pass. If you used AI all semester, you did it to yourself. Those who complain will have their past assignments audited and if AI was used they are reported for plagiarism. This will be the most valuable lesson.