Princeton University introduced proctoring and revised its century-old honor code, following student concerns that current academic practices have become untenable as AI tools are increasingly used. The update reflects a shift away from student self-monitoring and reporting as the main enforcement mechanism. Students historically helped oversee peers for suspected cheating, but the new approach is designed to address the practical enforcement challenge posed by generative AI in coursework. The change is likely to affect test-day logistics and how students experience assessment integrity policies, especially in courses where AI use complicates the distinction between allowed collaboration and unauthorized assistance.